Backlight doesn't change in GNOME does in Unity

[Anatoly]

anatoly@anatoly-Lenovo-B570e:~$ ubuntu-bug linux
anatoly@anatoly-Lenovo-B570e:~$ ls /sys/class/backlight > backlight
anatoly@anatoly-Lenovo-B570e:~$ grep -r . /proc/acpi > acpi
anatoly@anatoly-Lenovo-B570e:~$ sudo acpidump -o acpidump.txt
[sudo] пароль для anatoly:
anatoly@anatoly-Lenovo-B570e:~$ acpixtract acpidump.txt

Intel ACPI Component Architecture
ACPI Binary Table Extraction Utility version 20150717-64
Copyright (c) 2000 - 2015 Intel Corporation

Acpi table [DSDT] - 39619 bytes written to dsdt.dat
Acpi table [SSDT] - 4200 bytes written to ssdt1.dat
Acpi table [SSDT] - 2388 bytes written to ssdt2.dat
Acpi table [SSDT] - 2316 bytes written to ssdt3.dat
Acpi table [SSDT] - 2454 bytes written to ssdt4.dat
Acpi table [SSDT] - 1660 bytes written to ssdt5.dat
Acpi table [SSDT] - 771 bytes written to ssdt6.dat
Acpi table [SSDT] - 281 bytes written to ssdt7.dat
anatoly@anatoly-Lenovo-B570e:~$ iasl -d DSDT.dat

Intel ACPI Component Architecture
ASL+ Optimizing Compiler version 20150717-64
Copyright (c) 2000 - 2015 Intel Corporation

Could not open input file: No such file or directory
anatoly@anatoly-Lenovo-B570e:~$ sudo fwts > fwts
Test: Gather kernel system information.
  Gather kernel signature. 1 info only
  Gather kernel system information. 1 info only
  Gather kernel boot command line. 1 info only
  Gather ACPI driver version. 1 info only
Test: Gather BIOS DMI information.
  Gather BIOS DMI information 1 info only
Test: Scan kernel log for Oopses.
  Kernel log oops check. 2 passed
Test: Scan kernel log for errors and warnings.
  Kernel log error check. 1 passed
Test: MTRR tests.
  Validate the kernel MTRR IOMEM setup. 1 passed
  Validate the MTRR setup across all processors. 1 passed
  Test for AMD MtrrFixDramModEn being cleared by the B.. 1 skipped
Test: General ACPI information test.
  Determine Kernel ACPI version. 1 info only
  Determine machine's ACPI version. 1 info only
  Determine AML compiler. 1 info only
Test: Sanity check for UEFI Boot Path Boot####.
 Test aborted..
Test: UEFI secure boot test.
 Test skipped..
Test: UEFI Compatibility Support Module test.
  UEFI Compatibility Support Module test. 1 info only
Test: Test firmware has set PCI Express MaxReadReq to a higher value on n..
  Test firmware settings MaxReadReq for PCI Express de.. 1 passed
Test: Test PCI host bridge configuration using _CRS.
  Test PCI host bridge configuration using _CRS. 1 skipped
Test: PCIe ASPM test.
  PCIe ASPM ACPI test.
  PCIe ASPM registers test. 3 passed, 3 warnings
Test: DMI/SMBIOS table tests.
  Find and test SMBIOS Table Entry Points. 6 passed
  Test DMI/SMBIOS tables for errors. 34 passed, 37 failed, 1 skipped
Test: Test if system is using latest microcode.
  Test for most recent microcode being loaded. 1 skipped
Test: MSR register tests.
  Test CPU generic MSRs. 69 passed
  Test CPU specific model MSRs. 17 passed
  Test all P State Ratios. 2 passed
  Test C1 and C3 autodemotion. 1 passed
  Test SMRR MSR registers. 4 passed
Test: Test if CPU NX is disabled by the BIOS.
  Test CPU NX capability. 1 passed
  Test all CPUs have same BIOS set NX flag. 1 passed
  Test all CPUs have same msr setting in MSR 0x1a0. 1 passed
Test: CPU frequency scaling tests.
  CPU frequency table consistency 1 passed
  CPU frequency table duplicates 1 passed
  CPU frequency firmware limits 1 passed
  CPU frequency claimed maximum 1 failed, 2 warnings
  CPU frequency SW_ANY control 1 skipped
  CPU frequency SW_ALL control 1 skipped
  CPU frequency performance tests. 1 failed
Test: Test max CPU frequencies against max scaling frequency.
  Maximum CPU frequency test. 1 passed
Test: CPU Virtualisation Configuration test.
  CPU Virtualisation Configuration test. 1 skipped
Test: BIOS Support Installation structure test.
  PnP BIOS Support Installation structure test. 2 passed
Test: PCI IRQ Routing Table test.
  PCI IRQ Routing Table test. 4 passed
Test: MultiProcessor Tables tests.
 Test skipped..
Test: HDA Audio Pin Configuration test.
  HDA Audio Pin Configuration test. 2 passed
Test: Test EBDA region is mapped and reserved in memory map table.
  Test EBDA is reserved in E820 table. 1 passed
Test: BIOS32 Service Directory test.
  BIOS32 Service Directory test. 4 passed
Test: APIC edge/level test.
  Legacy and PCI Interrupt Edge/Level trigger tests. 4 failed
Test: XENV Xen Environment Table tests.
 Test aborted..
Test: XSDT Extended System Description Table test.
  XSDT Extended System Description Table test. 1 passed
Test: Extract and analyse Windows Management Instrumentation (WMI).
  Windows Management Instrumentation test. 2 passed, 1 failed
Test: WDAT Microsoft Hardware Watchdog Action Table test.
 Test skipped..
Test: ACPI Wakealarm tests.
  Test existence of RTC with alarm interface. 1 passed
  Trigger wakealarm for 1 seconds in the future. 1 passed
  Test if wakealarm is fired. 1 passed
  Multiple wakealarm firing tests. 1 passed
Test: WAET Windows ACPI Emulated Devices Table test.
 Test skipped..
Test: UEFI Data Table test.
  UEFI Data Table test. 1 passed
Test: TPM2 Trusted Platform Module 2 test.
 Test aborted..
Test: TCPA Trusted Computing Platform Alliance Capabilities Table test.
 Test aborted..
Test: Re-assemble DSDT and SSDTs to find syntax errors and warnings.
  Disassemble and reassemble DSDT and SSDTs. 104 failed
Test: STAO Status Override Table test.
 Test skipped..
Test: SRAT System Resource Affinity Table test.
 Test skipped..
Test: SPMI Service Processor Management Interface Description Table test.
 Test skipped..
Test: SPCR Serial Port Console Redirection Table test.
 Test skipped..
Test: SLIT System Locality Distance Information test.
 Test skipped..
Test: SLIC Software Licensing Description Table test.
  SLIC Software Licensing Description Table test. 1 passed
Test: SBST Smart Battery Specification Table test.
 Test skipped..
Test: RSDT Root System Description Table test.
  RSDT Root System Description Table test. 1 passed
Test: RSDP Root System Description Pointer test.
  RSDP Root System Description Pointer test. 1 passed
Test: Processor Clocking Control (PCC) test.
  Processor Clocking Control (PCC) test. 1 info only
Test: Disassemble DSDT to check for _OSI("Linux").
  Disassemble DSDT to check for _OSI("Linux"). 1 warning
Test: ACPI DSDT Method Semantic tests.
  Test Method Names. 1 passed
  Test _AEI. 1 skipped
  Test _EVT (Event Method). 1 skipped
  Test _DLM (Device Lock Mutex). 1 skipped
  Test _PIC (Inform AML of Interrupt Model). 3 passed
  Test _CID (Compatible ID). 6 passed
  Test _DDN (DOS Device Name). 1 skipped
  Test _HID (Hardware ID). 30 passed
  Test _HRV (Hardware Revision Number). 1 skipped
  Test _MLS (Multiple Language String). 1 skipped
  Test _PLD (Physical Device Location). 23 passed
  Test _SUB (Subsystem ID). 1 skipped
  Test _SUN (Slot User Number). 1 skipped
  Test _STR (String). 1 skipped
  Test _UID (Unique ID). 16 passed
  Test _CDM (Clock Domain). 1 skipped
  Test _CRS (Current Resource Settings). 23 passed
  Test _DSD (Device Specific Data). 1 skipped
  Test _DIS (Disable). 8 passed
  Test _DMA (Direct Memory Access). 1 skipped
  Test _FIX (Fixed Register Resource Provider). 1 skipped
  Test _GSB (Global System Interrupt Base). 1 skipped
  Test _HPP (Hot Plug Parameters). 1 skipped
  Test _PRS (Possible Resource Settings). 8 passed
  Test _PXM (Proximity). 1 skipped
  Test _CCA (Cache Coherency Attribute). 1 skipped
  Test _EDL (Eject Device List). 1 skipped
  Test _EJD (Ejection Dependent Device). 1 skipped
  Test _EJ0 (Eject). 1 skipped
  Test _EJ1 (Eject). 1 skipped
  Test _EJ2 (Eject). 1 skipped
  Test _EJ3 (Eject). 1 skipped
  Test _EJ4 (Eject). 1 skipped
  Test _LCK (Lock). 1 skipped
  Test _RMV (Remove). 1 skipped
  Test _STA (Status). 16 passed
  Test _DEP (Operational Region Dependencies). 1 skipped
  Test _BDN (BIOS Dock Name). 1 skipped
  Test _BBN (Base Bus Number). 1 passed
  Test _DCK (Dock). 1 skipped
  Test _INI (Initialize). 3 passed
  Test _GLK (Global Lock). 1 skipped
  Test _SEG (Segment). 1 skipped
  Test _OFF (Set resource off). 1 passed
  Test _ON (Set resource on). 1 skipped
  Test _DSW (Device Sleep Wake). 1 skipped
  Test _IRC (In Rush Current). 1 skipped
  Test _PRE (Power Resources for Enumeration). 1 skipped
  Test _PR0 (Power Resources for D0). 1 skipped
  Test _PR1 (Power Resources for D1). 1 skipped
  Test _PR2 (Power Resources for D2). 1 skipped
  Test _PR3 (Power Resources for D3). 1 skipped
  Test _PRW (Power Resources for Wake). 28 passed
  Test _PS0 (Power State 0). 1 passed
  Test _PS1 (Power State 1). 1 skipped
  Test _PS2 (Power State 2). 1 skipped
  Test _PS3 (Power State 3). 1 passed
  Test _PSC (Power State Current). 1 skipped
  Test _PSE (Power State for Enumeration). 1 skipped
  Test _PSW (Power State Wake). 3 passed
  Test _S1D (S1 Device State). 1 skipped
  Test _S2D (S2 Device State). 1 skipped
  Test _S3D (S3 Device State). 3 passed
  Test _S4D (S4 Device State). 3 passed
  Test _S0W (S0 Device Wake State). 1 skipped
  Test _S1W (S1 Device Wake State). 1 skipped
  Test _S2W (S2 Device Wake State). 1 skipped
  Test _S3W (S3 Device Wake State). 1 skipped
  Test _S4W (S4 Device Wake State). 1 skipped
  Test _RST (Device Reset). 1 skipped
  Test _PRR (Power Resource for Reset). 1 skipped
  Test _S0_ (S0 System State). 1 passed
  Test _S1_ (S1 System State). 1 passed
  Test _S2_ (S2 System State). 1 skipped
  Test _S3_ (S3 System State). 1 passed
  Test _S4_ (S4 System State). 1 passed
  Test _S5_ (S5 System State). 1 passed
  Test _SWS (System Wake Source). 1 skipped
  Test _PSS (Performance Supported States). 1 passed
  Test _CPC (Continuous Performance Control). 1 skipped
  Test _CSD (C State Dependencies). 1 skipped
  Test _CST (C States). 1 skipped
  Test _PCT (Performance Control). 1 passed
  Test _PDL (P-State Depth Limit). 1 skipped
  Test _PPC (Performance Present Capabilities). 1 passed
  Test _PPE (Polling for Platform Error). 1 skipped
  Test _PSD (Power State Dependencies). 1 passed
  Test _TDL (T-State Depth Limit). 1 skipped
  Test _TPC (Throttling Present Capabilities). 1 skipped
  Test _TSD (Throttling State Dependencies). 1 skipped
  Test _TSS (Throttling Supported States). 1 skipped
  Test _PUR (Processor Utilization Request). 1 skipped
  Test _MSG (Message). 1 skipped
  Test _SST (System Status). 1 skipped
  Test _ALC (Ambient Light Colour Chromaticity). 1 skipped
  Test _ALI (Ambient Light Illuminance). 1 skipped
  Test _ALT (Ambient Light Temperature). 1 skipped
  Test _ALP (Ambient Light Polling). 1 skipped
  Test _ALR (Ambient Light Response). 1 skipped
  Test _LID (Lid Status). 1 passed
  Test _GTF (Get Task File). 1 skipped
  Test _GTM (Get Timing Mode). 1 skipped
  Test _MBM (Memory Bandwidth Monitoring Data). 1 skipped
  Test _UPC (USB Port Capabilities). 23 passed
  Test _UPD (User Presence Detect). 1 skipped
  Test _UPP (User Presence Polling). 1 skipped
  Test _GCP (Get Capabilities). 1 skipped
  Test _GRT (Get Real Time). 1 skipped
  Test _GWS (Get Wake Status). 1 skipped
  Test _STP (Set Expired Timer Wake Policy). 1 skipped
  Test _STV (Set Timer Value). 1 skipped
  Test _TIP (Expired Timer Wake Policy). 1 skipped
  Test _TIV (Timer Values). 1 skipped
  Test _SBS (Smart Battery Subsystem). 1 skipped
  Test _BCT (Battery Charge Time). 1 skipped
  Test _BIF (Battery Information). 1 passed
  Test _BIX (Battery Information Extended). 1 skipped
  Test _BMA (Battery Measurement Averaging). 1 skipped
  Test _BMC (Battery Maintenance Control). 1 skipped
  Test _BMD (Battery Maintenance Data). 1 skipped
  Test _BMS (Battery Measurement Sampling Time). 1 skipped
  Test _BST (Battery Status). 1 passed
  Test _BTP (Battery Trip Point). 1 skipped
  Test _BTM (Battery Time). 1 skipped
  Test _PCL (Power Consumer List). 2 failed
  Test _PIF (Power Source Information). 1 skipped
  Test _PRL (Power Source Redundancy List). 1 skipped
  Test _PSR (Power Source). 1 passed
  Test _GAI (Get Averaging Level). 1 skipped
  Test _GHL (Get Harware Limit). 1 skipped
  Test _PMD (Power Meter Devices). 1 skipped
  Test _PMM (Power Meter Measurement). 1 skipped
  Test _FIF (Fan Information). 1 skipped
  Test _FPS (Fan Performance States). 1 skipped
  Test _FSL (Fan Set Level). 1 skipped
  Test _FST (Fan Status). 1 skipped
  Test _ACx (Active Cooling). 10 skipped
  Test _ART (Active Cooling Relationship Table). 1 skipped
  Test _CRT (Critical Trip Point). 2 passed
  Test _CR3 (Warm/Standby Temperature). 1 skipped
  Test _DTI (Device Temperature Indication). 1 skipped
  Test _HOT (Hot Temperature). 1 skipped
  Test _MTL (Minimum Throttle Limit). 1 skipped
  Test _NTT (Notification Temp Threshold). 1 skipped
  Test _PSL (Passive List). 1 passed
  Test _PSV (Passive Temp). 1 passed
  Test _RTV (Relative Temp Values). 1 skipped
  Test _SCP (Set Cooling Policy). 1 skipped
  Test _TC1 (Thermal Constant 1). 1 passed
  Test _TC2 (Thermal Constant 2). 1 passed
  Test _TMP (Thermal Zone Current Temp). 2 passed
  Test _TPT (Trip Point Temperature). 1 skipped
  Test _TRT (Thermal Relationship Table). 1 skipped
  Test _TSP (Thermal Sampling Period). 1 passed
  Test _TST (Temperature Sensor Threshold). 1 skipped
  Test _TZD (Thermal Zone Devices). 1 skipped
  Test _TZM (Thermal Zone member). 1 skipped
  Test _TZP (Thermal Zone Polling). 1 skipped
  Test _PTS (Prepare to Sleep). 5 passed
  Test _TTS (Transition to State). 1 skipped
  Test _S0 (System S0 State). 1 skipped
  Test _S1 (System S1 State). 1 skipped
  Test _S2 (System S2 State). 1 skipped
  Test _S3 (System S3 State). 1 skipped
  Test _S4 (System S4 State). 1 skipped
  Test _S5 (System S5 State). 1 skipped
  Test _WAK (System Wake). 5 passed
  Test _ADR (Return Unique ID for Device). 72 passed
  Test _BCL (Query List of Brightness Control Levels S.. 2 passed
  Test _BCM (Set Brightness Level). 2 passed
  Test _BQC (Brightness Query Current Level). 2 passed
  Test _DCS (Return the Status of Output Device). 12 passed
  Test _DDC (Return the EDID for this Device). 1 skipped
  Test _DSS (Device Set State). 12 passed
  Test _DGS (Query Graphics State). 12 passed
  Test _DOD (Enumerate All Devices Attached to Display.. 2 passed
  Test _DOS (Enable/Disable Output Switching). 2 passed
  Test _GPD (Get POST Device). 1 skipped
  Test _ROM (Get ROM Data). 1 passed
  Test _SPD (Set POST Device). 1 skipped
  Test _VPO (Video POST Options). 1 skipped
  Test _CBA (Configuration Base Address). 1 skipped
  Test _IFT (IPMI Interface Type). 1 skipped
  Test _SRV (IPMI Interface Revision). 1 skipped
Test: MSDM Microsoft Data Management Table test.
 Test skipped..
Test: MCHI Management Controller Host Interface Table test.
 Test skipped..
Test: MCFG PCI Express* memory mapped config space test.
  Validate MCFG table. 1 passed
  Validate MCFG PCI config space. 1 passed
Test: MADT Multiple APIC Description Table test.
  MADT Multiple APIC Description Table test. 1 passed
Test: LPIT Low Power Idle Table test.
 Test skipped..
Test: IORT IO Remapping Table test.
 Test skipped..
Test: HPET IA-PC High Precision Event Timer Table tests.
  Test HPET base in kernel log.
  Test HPET base in HPET table. 1 passed
  Test HPET base in DSDT and/or SSDT.
  Test HPET configuration.
Test: HEST Hardware Error Source Table test.
 Test skipped..
Test: GTDT Generic Timer Description Table test.
 Test skipped..
Test: FPDT Firmware Performance Data Table test.
 Test skipped..
Test: Simple fan tests.
  Test fan status. 3 passed, 1 failed
  Load system, check CPU fan status.
Test: FADT Fixed ACPI Description Table tests.
  Test FADT ACPI Description Table tests. 1 passed
  Test FADT SCI_EN bit is enabled. 1 passed
  Test FADT reset register. 2 passed
Test: FACS Firmware ACPI Control Structure test.
  FACS Firmware ACPI Control Structure test. 1 passed
Test: ERST Error Record Serialization Table test.
 Test skipped..
Test: ECDT Embedded Controller Boot Resources Table test.
 Test skipped..
Test: DMA Remapping (VT-d) test.
  DMA Remapping test. 1 skipped
Test: DBG2 (Debug Port Table 2) test.
 Test skipped..
Test: DBGP (Debug Port) Table test.
 Test skipped..
Test: Processor C state support test.
  Test all CPUs C-states. 2 passed
Test: CSRT Core System Resource Table test.
 Test skipped..
Test: CPEP Corrected Platform Error Polling Table test.
 Test skipped..
Test: ACPI table checksum test.
  ACPI table checksum test. 19 passed
Test: Automated LCD brightness test.
  Test for maximum and actual brightness. 4 passed
  Change actual brightness. 1 passed, 1 failed
Test: BOOT Table test.
 Test skipped..
Test: BGRT Boot Graphics Resource Table test.
 Test skipped..
Test: BERT Boot Error Record Table test.
 Test skipped..
Test: ASF! Alert Standard Format Table test.
  ASF! Alert Standard Format Table test. 6 passed
Test: Test for single instance of APIC/MADT table.
  Test for single instance of APIC/MADT table. 1 passed
Test: ACPI table headers sanity tests.
  Test ACPI headers. 17 passed
anatoly@anatoly-Lenovo-B570e:~$ sudo fwts method > fwts_method
Test: ACPI DSDT Method Semantic tests.
  Test Method Names. 1 passed
  Test _AEI. 1 skipped
  Test _EVT (Event Method). 1 skipped
  Test _DLM (Device Lock Mutex). 1 skipped
  Test _PIC (Inform AML of Interrupt Model). 3 passed
  Test _CID (Compatible ID). 6 passed
  Test _DDN (DOS Device Name). 1 skipped
  Test _HID (Hardware ID). 30 passed
  Test _HRV (Hardware Revision Number). 1 skipped
  Test _MLS (Multiple Language String). 1 skipped
  Test _PLD (Physical Device Location). 23 passed
  Test _SUB (Subsystem ID). 1 skipped
  Test _SUN (Slot User Number). 1 skipped
  Test _STR (String). 1 skipped
  Test _UID (Unique ID). 16 passed
  Test _CDM (Clock Domain). 1 skipped
  Test _CRS (Current Resource Settings). 23 passed
  Test _DSD (Device Specific Data). 1 skipped
  Test _DIS (Disable). 8 passed
  Test _DMA (Direct Memory Access). 1 skipped
  Test _FIX (Fixed Register Resource Provider). 1 skipped
  Test _GSB (Global System Interrupt Base). 1 skipped
  Test _HPP (Hot Plug Parameters). 1 skipped
  Test _PRS (Possible Resource Settings). 8 passed
  Test _PXM (Proximity). 1 skipped
  Test _CCA (Cache Coherency Attribute). 1 skipped
  Test _EDL (Eject Device List). 1 skipped
  Test _EJD (Ejection Dependent Device). 1 skipped
  Test _EJ0 (Eject). 1 skipped
  Test _EJ1 (Eject). 1 skipped
  Test _EJ2 (Eject). 1 skipped
  Test _EJ3 (Eject). 1 skipped
  Test _EJ4 (Eject). 1 skipped
  Test _LCK (Lock). 1 skipped
  Test _RMV (Remove). 1 skipped
  Test _STA (Status). 16 passed
  Test _DEP (Operational Region Dependencies). 1 skipped
  Test _BDN (BIOS Dock Name). 1 skipped
  Test _BBN (Base Bus Number). 1 passed
  Test _DCK (Dock). 1 skipped
  Test _INI (Initialize). 3 passed
  Test _GLK (Global Lock). 1 skipped
  Test _SEG (Segment). 1 skipped
  Test _OFF (Set resource off). 1 passed
  Test _ON (Set resource on). 1 skipped
  Test _DSW (Device Sleep Wake). 1 skipped
  Test _IRC (In Rush Current). 1 skipped
  Test _PRE (Power Resources for Enumeration). 1 skipped
  Test _PR0 (Power Resources for D0). 1 skipped
  Test _PR1 (Power Resources for D1). 1 skipped
  Test _PR2 (Power Resources for D2). 1 skipped
  Test _PR3 (Power Resources for D3). 1 skipped
  Test _PRW (Power Resources for Wake). 28 passed
  Test _PS0 (Power State 0). 1 passed
  Test _PS1 (Power State 1). 1 skipped
  Test _PS2 (Power State 2). 1 skipped
  Test _PS3 (Power State 3). 1 passed
  Test _PSC (Power State Current). 1 skipped
  Test _PSE (Power State for Enumeration). 1 skipped
  Test _PSW (Power State Wake). 3 passed
  Test _S1D (S1 Device State). 1 skipped
  Test _S2D (S2 Device State). 1 skipped
  Test _S3D (S3 Device State). 3 passed
  Test _S4D (S4 Device State). 3 passed
  Test _S0W (S0 Device Wake State). 1 skipped
  Test _S1W (S1 Device Wake State). 1 skipped
  Test _S2W (S2 Device Wake State). 1 skipped
  Test _S3W (S3 Device Wake State). 1 skipped
  Test _S4W (S4 Device Wake State). 1 skipped
  Test _RST (Device Reset). 1 skipped
  Test _PRR (Power Resource for Reset). 1 skipped
  Test _S0_ (S0 System State). 1 passed
  Test _S1_ (S1 System State). 1 passed
  Test _S2_ (S2 System State). 1 skipped
  Test _S3_ (S3 System State). 1 passed
  Test _S4_ (S4 System State). 1 passed
  Test _S5_ (S5 System State). 1 passed
  Test _SWS (System Wake Source). 1 skipped
  Test _PSS (Performance Supported States). 1 passed
  Test _CPC (Continuous Performance Control). 1 skipped
  Test _CSD (C State Dependencies). 1 skipped
  Test _CST (C States). 1 skipped
  Test _PCT (Performance Control). 1 passed
  Test _PDL (P-State Depth Limit). 1 skipped
  Test _PPC (Performance Present Capabilities). 1 passed
  Test _PPE (Polling for Platform Error). 1 skipped
  Test _PSD (Power State Dependencies). 1 passed
  Test _TDL (T-State Depth Limit). 1 skipped
  Test _TPC (Throttling Present Capabilities). 1 skipped
  Test _TSD (Throttling State Dependencies). 1 skipped
  Test _TSS (Throttling Supported States). 1 skipped
  Test _PUR (Processor Utilization Request). 1 skipped
  Test _MSG (Message). 1 skipped
  Test _SST (System Status). 1 skipped
  Test _ALC (Ambient Light Colour Chromaticity). 1 skipped
  Test _ALI (Ambient Light Illuminance). 1 skipped
  Test _ALT (Ambient Light Temperature). 1 skipped
  Test _ALP (Ambient Light Polling). 1 skipped
  Test _ALR (Ambient Light Response). 1 skipped
  Test _LID (Lid Status). 1 passed
  Test _GTF (Get Task File). 1 skipped
  Test _GTM (Get Timing Mode). 1 skipped
  Test _MBM (Memory Bandwidth Monitoring Data). 1 skipped
  Test _UPC (USB Port Capabilities). 23 passed
  Test _UPD (User Presence Detect). 1 skipped
  Test _UPP (User Presence Polling). 1 skipped
  Test _GCP (Get Capabilities). 1 skipped
  Test _GRT (Get Real Time). 1 skipped
  Test _GWS (Get Wake Status). 1 skipped
  Test _STP (Set Expired Timer Wake Policy). 1 skipped
  Test _STV (Set Timer Value). 1 skipped
  Test _TIP (Expired Timer Wake Policy). 1 skipped
  Test _TIV (Timer Values). 1 skipped
  Test _SBS (Smart Battery Subsystem). 1 skipped
  Test _BCT (Battery Charge Time). 1 skipped
  Test _BIF (Battery Information). 1 passed
  Test _BIX (Battery Information Extended). 1 skipped
  Test _BMA (Battery Measurement Averaging). 1 skipped
  Test _BMC (Battery Maintenance Control). 1 skipped
  Test _BMD (Battery Maintenance Data). 1 skipped
  Test _BMS (Battery Measurement Sampling Time). 1 skipped
  Test _BST (Battery Status). 1 passed
  Test _BTP (Battery Trip Point). 1 skipped
  Test _BTM (Battery Time). 1 skipped
  Test _PCL (Power Consumer List). 2 failed
  Test _PIF (Power Source Information). 1 skipped
  Test _PRL (Power Source Redundancy List). 1 skipped
  Test _PSR (Power Source). 1 passed
  Test _GAI (Get Averaging Level). 1 skipped
  Test _GHL (Get Harware Limit). 1 skipped
  Test _PMD (Power Meter Devices). 1 skipped
  Test _PMM (Power Meter Measurement). 1 skipped
  Test _FIF (Fan Information). 1 skipped
  Test _FPS (Fan Performance States). 1 skipped
  Test _FSL (Fan Set Level). 1 skipped
  Test _FST (Fan Status). 1 skipped
  Test _ACx (Active Cooling). 10 skipped
  Test _ART (Active Cooling Relationship Table). 1 skipped
  Test _CRT (Critical Trip Point). 2 passed
  Test _CR3 (Warm/Standby Temperature). 1 skipped
  Test _DTI (Device Temperature Indication). 1 skipped
  Test _HOT (Hot Temperature). 1 skipped
  Test _MTL (Minimum Throttle Limit). 1 skipped
  Test _NTT (Notification Temp Threshold). 1 skipped
  Test _PSL (Passive List). 1 passed
  Test _PSV (Passive Temp). 1 passed
  Test _RTV (Relative Temp Values). 1 skipped
  Test _SCP (Set Cooling Policy). 1 skipped
  Test _TC1 (Thermal Constant 1). 1 passed
  Test _TC2 (Thermal Constant 2). 1 passed
  Test _TMP (Thermal Zone Current Temp). 2 passed
  Test _TPT (Trip Point Temperature). 1 skipped
  Test _TRT (Thermal Relationship Table). 1 skipped
  Test _TSP (Thermal Sampling Period). 1 passed
  Test _TST (Temperature Sensor Threshold). 1 skipped
  Test _TZD (Thermal Zone Devices). 1 skipped
  Test _TZM (Thermal Zone member). 1 skipped
  Test _TZP (Thermal Zone Polling). 1 skipped
  Test _PTS (Prepare to Sleep). 5 passed
  Test _TTS (Transition to State). 1 skipped
  Test _S0 (System S0 State). 1 skipped
  Test _S1 (System S1 State). 1 skipped
  Test _S2 (System S2 State). 1 skipped
  Test _S3 (System S3 State). 1 skipped
  Test _S4 (System S4 State). 1 skipped
  Test _S5 (System S5 State). 1 skipped
  Test _WAK (System Wake). 5 passed
  Test _ADR (Return Unique ID for Device). 72 passed
  Test _BCL (Query List of Brightness Control Levels S.. 2 passed
  Test _BCM (Set Brightness Level). 2 passed
  Test _BQC (Brightness Query Current Level). 2 passed
  Test _DCS (Return the Status of Output Device). 12 passed
  Test _DDC (Return the EDID for this Device). 1 skipped
  Test _DSS (Device Set State). 12 passed
  Test _DGS (Query Graphics State). 12 passed
  Test _DOD (Enumerate All Devices Attached to Display.. 2 passed
  Test _DOS (Enable/Disable Output Switching). 2 passed
  Test _GPD (Get POST Device). 1 skipped
  Test _ROM (Get ROM Data). 1 passed
  Test _SPD (Set POST Device). 1 skipped
  Test _VPO (Video POST Options). 1 skipped
  Test _CBA (Configuration Base Address). 1 skipped
  Test _IFT (IPMI Interface Type). 1 skipped
  Test _SRV (IPMI Interface Revision). 1 skipped
anatoly@anatoly-Lenovo-B570e:~$ sudo dmidecode > dmidecode.log
anatoly@anatoly-Lenovo-B570e:~$ cat /proc/version_signature > version.log
anatoly@anatoly-Lenovo-B570e:~$ sudo lspci -vnvn > lspci-vnvn.log

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-18-generic 4.2.0-18.22
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: anatoly 2137 F...m pulseaudio
 /dev/snd/controlC0: anatoly 2137 F.... pulseaudio
CurrentDesktop: GNOME
Date: Thu Nov 26 22:42:47 2015
HibernationDevice: RESUME=UUID=18f353a3-951e-4c9b-9686-1138591c669e
InstallationDate: Installed on 2015-10-31 (25 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: LENOVO HuronRiver Platform
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=5f0a47d7-e6a3-4008-9afb-c4f2927ebf4f ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-18-generic N/A
 linux-backports-modules-4.2.0-18-generic N/A
 linux-firmware 1.149.2
SourcePackage: linux
UdevLog: Error: [Errno 2] Нет такого файла или каталога: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/18/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 44CN41WW
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Emerald Lake
dmi.board.vendor: LENOVO
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnLENOVO:bvr44CN41WW:bd08/18/2011:svnLENOVO:pnHuronRiverPlatform:pvrLenovoB570e:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
dmi.product.name: HuronRiver Platform
dmi.product.version: Lenovo B570e
dmi.sys.vendor: LENOVO

[Anatoly (anatolyosipov1)]

The problem is that the slider move, but brightness doesn't change.
This command decreases the brightness:
echo 8 > /sys/class/backlight/intel_backlight/brightness

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.4 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc3-wily

[Anatoly (anatolyosipov1)]

InUbuntu14.04with kernel3.16the issue issolved so:
http://compizomania.blogspot.de/2014/06/ubuntu-1404linux-mint-17.htmlTo
upgrade the kernelhas not yet happened, asthere was little timeand
knowledge.Whenwill updatebe sure to writeyou. InDebianJessiehas decided
as follows:addedin/etc/defaults/grubinthe
variablevalueGRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"

30.11.2015 23:47, Joseph Salisbury пишет:
> Did this issue start happening after an update/upgrade? Was there a
> prior kernel version where you were not having this particular problem?
>
> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v4.4 kernel[0].
>
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
>
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
>
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> Thanks in advance.
>
> [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc3-wily
>
> ** Changed in: linux (Ubuntu)
> Importance: Undecided => Medium
>
> ** Changed in: linux (Ubuntu)
> Status: Confirmed => Incomplete
>

[Anatoly (anatolyosipov1)]

kernel-bug-exists-upstream

30.11.2015 23:47, Joseph Salisbury пишет:
> Did this issue start happening after an update/upgrade? Was there a
> prior kernel version where you were not having this particular problem?
>
> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v4.4 kernel[0].
>
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
>
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
>
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> Thanks in advance.
>
> [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc3-wily
>
> ** Changed in: linux (Ubuntu)
> Importance: Undecided => Medium
>
> ** Changed in: linux (Ubuntu)
> Status: Confirmed => Incomplete
>

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

[penalvch (penalvch)]

Anatoly, could you please test the latest mainline kernel (4.5-rc3) and advise to the results?

[Anatoly (anatolyosipov1)]

Christopher, I tried the kernel (4.5-rc3). The result - the backlight is not adjustable. I think the problem is not in the kernel.
I use Ubuntu Gnome, but more than a month ago, I installed the MATE environment, right at the gnome, then Gnome and MATE mixed up, but surrounded by MATE the lighting was regulated, with kernels 4.2. I think it is Gnome. Only I didn't realize to whom to report it. I would be grateful if prompt.

[penalvch (penalvch)]

Anatoly, could you please advise to any WORKAROUNDs as outlined in https://wiki.ubuntu.com/Kernel/Debugging/Backlight ?

[Anatoly (anatolyosipov1)]

sudo nautilus /sys/class/backlight/intel_backlight
then edit the file "brightness"
Of the ways described here: https://wiki.ubuntu.com/Kernel/Debugging/Backlight it only works: echo 8 > /sys/class/backlight/intel_backlight/brightness

[penalvch (penalvch)]

Anatoly, to see if this issue is limited to the GNOME environment, could you please test for this via http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?

[Anatoly (anatolyosipov1)]

Christopher, on Ubuntu 16.04, the problem with the backlight decided easy for this recipe:
create a file named 20-intel.conf
sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
opened it for editing
sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
insert lines
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
saved and rebooted
brightness adjustment earned.
In unity with Ubuntu 14.04, 15.10, 16.04 it works, but on Ubuntu GNOME not.
The report failed to do. There was the program to install:
sudo apt-get install -y fwts acpidump dmidecode iasl

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[benbennett (benbennett)]

Affects dell m4800 and m6800 with nvidia/intel card.

[benbennett (benbennett)]

I am pretty sure this is kernel bug.
as root
echo 1 > /sys/class/backlight/acpi_video0/brightness
has no effect and xbacklight still works as described at the end of https://wiki.archlinux.org/index.php/backlight#sysfs_modified_but_no_brightness_change

[benbennett (benbennett)]

Enabling dual graphics/nvidia optimus in bios fixed the problem for me.
When dual graphics is disabled the driver load produces the following path.
/sys/class/backlight/acpi_video0/

but with dual graphics enabled , the following path is created.
 /sys/class/backlight/intel_backlight

Finally I am pretty sure unity/xbacklight are using xrandr to change the brightness so that ends
up using the graphics card driver to change the brightness.

Where gnome is using the kernel path for an acpi call.

I don't if it kernel bug or bios or video card bug for not handling the acpi call correctly.

Might be better if gnome used xrandr instead or be able to switch.

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu GNOME 16.04 (xenial) reached end-of-life on April, 2019

https://ubuntugnome.org/ubuntu-gnome-16-04-lts-is-here/
https://wiki.ubuntu.com/XenialXerus/ReleaseNotes/UbuntuGNOME

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.