[TOSHIBA SATELLITE C55-C] Black screen (light screen off) after closing the pivotal laptop screen

[Msd]

A friend of mine has a TOSHIBA SATELLITE C55-C and I installed xUbuntu 20.04 LTS.

I have a minor problem linked to a major problem :

- Minor problem : it is impossible to adjust the light of the screen.

- Major problem : when closing the laptop screen and opening it again, the light of the screen stay off and it is impossible to turn it on again.

Can you help me ?

Detail behaviour without changing anything
-----------------------------------------

I discovered that the keyboard button controls the `/sys/class/backlight/intel_backlight/brightness` and modifying the light value with keyboard button or directly by 'echo $INT_VALUE > /sys/class/backlight/intel_backlight/brightness' do the same thing.

You can change screen light value with the light keyboard buttons, but it does not change anything. The only thing that change is that if you set the light to '0', then the screen light is off. And when you put a value more than '0' then the screen light is full luminosity ('1' is the same effect as '1000').

Not working solutions
---------------------

I have tried a lot of things hoping for a solving solution :

In `/etc/default/grub`, I have tried without success :
- GRUB_CMDLINE_LINUX='acpi_backlight=vendor'
- GRUB_CMDLINE_LINUX='acpi_backlight=vendor acpi_osi=linux'
- GRUB_CMDLINE_LINUX='acpi_backlight=video'
- GRUB_CMDLINE_LINUX='video.disable_backlight_sysfs_if=1'
- GRUB_CMDLINE_LINUX='video.brightness_switch_enabled=0'
- GRUB_CMDLINE_LINUX='pcie_aspm=force acpi_osi=Linux acpi_backlight=legacy'

I have read :

- https://askubuntu.com/a/1311344
- https://askubuntu.com/questions/1034305/brightness-problem-ubuntu-18-04-lts
- https://bbs.archlinux.org/viewtopic.php?id=195967&p=2
- https://askubuntu.com/questions/451165/toshiba-satellite-p850-fn-keys-not-working
- https://wiki.archlinux.org/index.php/Backlight
- https://bugzilla.redhat.com/show_bug.cgi?id=1126159

Not acceptable solution : 'acpi=off'
------------------------------------

The only solution I have found "working" is to set "GRUB_CMDLINE_LINUX='acpi=off'".

That way, when closing the laptop screen : the light goes off. And when opening the laptop screen : the light goes on (max value).

In this configuration, it is impossible to adjust the screen light by modifying /sys/class/backlight/intel_backlight/brightness.

For example : 'echo 0 > /sys/class/backlight/intel_backlight/brightness' let the screen light on.

I thought it was an acceptable behaviour, until I saw a major problem.

The computer is slower than before, because only 1 CPU (instead of 4) is detected.

So I can't stay with that configuration.

Computer specifications
-----------------------

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.
49 structures occupying 2491 bytes.
Table at 0x000E6EE0.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
 Vendor: INSYDE Corp.
 Version: 5.20
 Release Date: 09/15/2015
 Address: 0xF0000
 Runtime Size: 64 kB
 ROM Size: 3072 kB
 Characteristics:
  PCI is supported
  BIOS is upgradeable
  BIOS shadowing is allowed
  Boot from CD is supported
  Selectable boot is supported
  EDD is supported
  8042 keyboard services are supported (int 9h)
  Serial services are supported (int 14h)
  Printer services are supported (int 17h)
  CGA/mono video services are supported (int 10h)
  ACPI is supported
  USB legacy is supported
  ATAPI Zip drive boot is supported
  BIOS boot specification is supported
  Function key-initiated network boot is supported
  Targeted content distribution is supported
 BIOS Revision: 5.20
 Firmware Revision: 5.0

Handle 0x0001, DMI type 1, 27 bytes
System Information
 Manufacturer: TOSHIBA
 Product Name: SATELLITE C55-C
 Version: PSCP6E-01F03HFR
 Serial Number: YF176764C
 UUID: 0a28c286-2265-8c43-896c-6b968f92ea27
 Wake-up Type: Power Switch
 SKU Number: PSCP6E
 Family: Type1 - Family

Handle 0x0002, DMI type 2, 17 bytes
Base Board Information
 Manufacturer: FF50
 Product Name: 06F5
 Version: Type2 - Board Version
 Serial Number: QC020RBF4601368
 Asset Tag:
 Features:
  Board is a hosting board
  Board is replaceable
 Location In Chassis: Type2 - Board Chassis Location
 Chassis Handle: 0x0003
 Type: Motherboard
 Contained Object Handles: 0

Handle 0x0003, DMI type 3, 25 bytes
Chassis Information
 Manufacturer: OEM Chassis ManuFacturer
 Type: Notebook
 Lock: Not Present
 Version: OEM Chassis Version
 Serial Number: OEM Chassis Serial Number
 Asset Tag: No Asset Tag
 Boot-up State: Safe
 Power Supply State: Safe
 Thermal State: Safe
 Security Status: None
 OEM Information: 0x00000000
 Height: Unspecified
 Number Of Power Cords: 1
 Contained Elements: 0
 SKU Number: SKU Number

Handle 0x0004, DMI type 4, 42 bytes
Processor Information
 Socket Designation: CHV
 Type: Central Processor
 Family: Pentium
 Manufacturer: Intel(R) Corporation
 ID: C3 06 04 00 FF FB EB BF
 Signature: Type 0, Family 6, Model 76, Stepping 3
 Flags:
  FPU (Floating-point unit on-chip)
  VME (Virtual mode extension)
  DE (Debugging extension)
  PSE (Page size extension)
  TSC (Time stamp counter)
  MSR (Model specific registers)
  PAE (Physical address extension)
  MCE (Machine check exception)
  CX8 (CMPXCHG8 instruction supported)
  APIC (On-chip APIC hardware supported)
  SEP (Fast system call)
  MTRR (Memory type range registers)
  PGE (Page global enable)
  MCA (Machine check architecture)
  CMOV (Conditional move instruction supported)
  PAT (Page attribute table)
  PSE-36 (36-bit page size extension)
  CLFSH (CLFLUSH instruction supported)
  DS (Debug store)
  ACPI (ACPI supported)
  MMX (MMX technology supported)
  FXSR (FXSAVE and FXSTOR instructions supported)
  SSE (Streaming SIMD extensions)
  SSE2 (Streaming SIMD extensions 2)
  SS (Self-snoop)
  HTT (Multi-threading)
  TM (Thermal monitor supported)
  PBE (Pending break enabled)
 Version: Intel(R) Pentium(R) CPU N3700 @ 1.60GHz
 Voltage: 4.0 V
 External Clock: 83 MHz
 Max Speed: 1660 MHz
 Current Speed: 1600 MHz
 Status: Populated, Enabled
 Upgrade: Slot 1
 L1 Cache Handle: 0x0006
 L2 Cache Handle: 0x0007
 L3 Cache Handle: Not Provided
 Serial Number: To Be Filled By O.E.M.
 Asset Tag: To Be Filled By O.E.M.
 Part Number: To Be Filled By O.E.M.
 Core Count: 4
 Core Enabled: 4
 Thread Count: 4
 Characteristics:
  64-bit capable
  Multi-Core
  Execute Protection
  Enhanced Virtualization
  Power/Performance Control

Handle 0x0005, DMI type 7, 19 bytes
Cache Information
 Socket Designation: L1 Cache
 Configuration: Enabled, Not Socketed, Level 1
 Operational Mode: Write Back
 Location: Internal
 Installed Size: 24 kB
 Maximum Size: 24 kB
 Supported SRAM Types:
  Synchronous
 Installed SRAM Type: Synchronous
 Speed: Unknown
 Error Correction Type: Parity
 System Type: Data
 Associativity: Other

Handle 0x0006, DMI type 7, 19 bytes
Cache Information
 Socket Designation: L1 Cache
 Configuration: Enabled, Not Socketed, Level 1
 Operational Mode: Write Back
 Location: Internal
 Installed Size: 32 kB
 Maximum Size: 32 kB
 Supported SRAM Types:
  Synchronous
 Installed SRAM Type: Synchronous
 Speed: Unknown
 Error Correction Type: Parity
 System Type: Instruction
 Associativity: 8-way Set-associative

Handle 0x0007, DMI type 7, 19 bytes
Cache Information
 Socket Designation: L2 Cache
 Configuration: Enabled, Not Socketed, Level 2
 Operational Mode: Write Back
 Location: Internal
 Installed Size: 1024 kB
 Maximum Size: 1024 kB
 Supported SRAM Types:
  Synchronous
 Installed SRAM Type: Synchronous
 Speed: Unknown
 Error Correction Type: Single-bit ECC
 System Type: Unified
 Associativity: 16-way Set-associative

Handle 0x0008, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J1A2
 Internal Connector Type: None
 External Reference Designator: USB2.0
 External Connector Type: Access Bus (USB)
 Port Type: USB

Handle 0x0009, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J1A2
 Internal Connector Type: None
 External Reference Designator: USB2.0
 External Connector Type: Access Bus (USB)
 Port Type: USB

Handle 0x000A, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J2A2
 Internal Connector Type: None
 External Reference Designator: USB3.0 Port0
 External Connector Type: Access Bus (USB)
 Port Type: USB

Handle 0x000B, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J9D1
 Internal Connector Type: None
 External Reference Designator: UART to Micro USB
 External Connector Type: Access Bus (USB)
 Port Type: USB

Handle 0x000C, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: CON6A1
 Internal Connector Type: None
 External Reference Designator: SD Card
 External Connector Type: Other
 Port Type: Other

Handle 0x000D, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J9B1
 Internal Connector Type: None
 External Reference Designator: Keyboard
 External Connector Type: PS/2
 Port Type: Keyboard Port

Handle 0x000E, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J9B1
 Internal Connector Type: None
 External Reference Designator: Mouse
 External Connector Type: PS/2
 Port Type: Mouse Port

Handle 0x000F, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J5A1
 Internal Connector Type: None
 External Reference Designator: Microphone
 External Connector Type: Mini Jack (headphones)
 Port Type: Audio Port

Handle 0x0010, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J5A1
 Internal Connector Type: None
 External Reference Designator: Line In
 External Connector Type: Mini Jack (headphones)
 Port Type: Audio Port

Handle 0x0011, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J5A1
 Internal Connector Type: None
 External Reference Designator: Line Out
 External Connector Type: Mini Jack (headphones)
 Port Type: Audio Port

Handle 0x0012, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J7A1
 Internal Connector Type: None
 External Reference Designator: Audio Jack
 External Connector Type: Mini Jack (headphones)
 Port Type: Audio Port

Handle 0x0013, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J2A2
 Internal Connector Type: None
 External Reference Designator: Network Rj45 Jack
 External Connector Type: RJ-45
 Port Type: Network Port

Handle 0x0014, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J4J1
 Internal Connector Type: None
 External Reference Designator: SATA
 External Connector Type: SAS/SATA Plug Receptacle
 Port Type: Other

Handle 0x0015, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J4E2
 Internal Connector Type: SAS/SATA Plug Receptacle
 External Reference Designator: SATA Cable
 External Connector Type: None
 Port Type: Other

Handle 0x0016, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J4A1
 Internal Connector Type: None
 External Reference Designator: VGA
 External Connector Type: DB-15 female
 Port Type: Video Port

Handle 0x0017, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J1A1
 Internal Connector Type: None
 External Reference Designator: Display Port
 External Connector Type: Other
 Port Type: Video Port

Handle 0x0018, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J3A1
 Internal Connector Type: None
 External Reference Designator: Display Port
 External Connector Type: Other
 Port Type: Video Port

Handle 0x0019, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J9B4
 Internal Connector Type: None
 External Reference Designator: Serial Port
 External Connector Type: DB-9 male
 Port Type: Serial Port 16550A Compatible

Handle 0x001A, DMI type 8, 9 bytes
Port Connector Information
 Internal Reference Designator: J2A1
 Internal Connector Type: None
 External Reference Designator: HDMI
 External Connector Type: Other
 Port Type: Other

Handle 0x001B, DMI type 9, 17 bytes
System Slot Information
 Designation: J5C1
 Type: x4 PCI Express x4
 Current Usage: Available
 Length: Other
 ID: 0
 Characteristics:
  PME signal is supported
  Hot-plug devices are supported
  SMBus signal is supported
 Bus Address: 0000:00:00.0

Handle 0x001C, DMI type 9, 17 bytes
System Slot Information
 Designation: J4B3
 Type: x1 PCI Express x1
 Current Usage: Available
 Length: Other
 ID: 0
 Characteristics:
  PME signal is supported
  Hot-plug devices are supported
  SMBus signal is supported
 Bus Address: 0000:00:00.0

Handle 0x001D, DMI type 9, 17 bytes
System Slot Information
 Designation: J6C1
 Type: x1 PCI Express x1
 Current Usage: Available
 Length: Other
 ID: 0
 Characteristics:
  PME signal is supported
  Hot-plug devices are supported
  SMBus signal is supported
 Bus Address: 0000:00:00.0

Handle 0x001E, DMI type 9, 17 bytes
System Slot Information
 Designation: J6D1
 Type: x1 PCI Express x1
 Current Usage: Available
 Length: Other
 ID: 0
 Characteristics:
  PME signal is supported
  Hot-plug devices are supported
  SMBus signal is supported
 Bus Address: 0000:00:00.0

Handle 0x001F, DMI type 11, 5 bytes
OEM Strings
 String 1: PSCP6E-01F03HFR,R19260S8,A
 String 2: 2S4F4Jqc4VDx4
 String 3: RpdXMN3Vh8lHM
 String 4: mDrTgdxCJWs3y
 String 5: String5 for Original Equipment Manufacturer

Handle 0x0020, DMI type 12, 5 bytes
System Configuration Options
 Option 1: SMI:00B2C202
 Option 2: DSN:2046E4C897D4
 Option 3: DSN:HMT451S6BFR8A-PB 17560819
 Option 4: String4 for Type12 Equipment Manufacturer
 Option 5: GSW:1
 Option 6: String6 for Type12 Equipment Manufacturer

Handle 0x0021, DMI type 13, 22 bytes
BIOS Language Information
 Language Description Format: Long
 Installable Languages: 8
  en|US|iso8859-1,0
  fr|CA|iso8859-1,0
  zh|TW|unicode,0
  ja|JP|unicode,0
  it|IT|iso8859-1,0
  es|ES|iso8859-1,0
  de|DE|iso8859-1,0
  pt|PT|iso8859-1,0
 Currently Installed Language: en|US|iso8859-1,0

Handle 0x0022, DMI type 15, 29 bytes
System Event Log
 Area Length: 0 bytes
 Header Start Offset: 0x0000
 Header Length: 8192 bytes
 Data Start Offset: 0x2000
 Access Method: General-purpose non-volatile data functions
 Access Address: 0x0000
 Status: Valid, Not Full
 Change Token: 0x12345678
 Header Format: OEM-specific
 Supported Log Type Descriptors: 0

Handle 0x0023, DMI type 16, 23 bytes
Physical Memory Array
 Location: System Board Or Motherboard
 Use: System Memory
 Error Correction Type: None
 Maximum Capacity: 8 GB
 Error Information Handle: No Error
 Number Of Devices: 2

Handle 0x0024, DMI type 17, 40 bytes
Memory Device
 Array Handle: 0x0023
 Error Information Handle: No Error
 Total Width: 8 bits
 Data Width: 8 bits
 Size: 4096 MB
 Form Factor: SODIMM
 Set: None
 Locator: ChannelA-DIMM0
 Bank Locator: BANK 0
 Type: DDR3
 Type Detail: Synchronous
 Speed: 1600 MT/s
 Manufacturer: Hynix/Hyundai
 Serial Number: 17560819
 Asset Tag: 9876543210
 Part Number: HMT451S6BFR8A-PB
 Rank: Unknown
 Configured Memory Speed: 1600 MT/s
 Minimum Voltage: 1.5 V
 Maximum Voltage: 1.5 V
 Configured Voltage: Unknown

Handle 0x0025, DMI type 19, 31 bytes
Memory Array Mapped Address
 Starting Address: 0x00000000000
 Ending Address: 0x000FFFFFFFF
 Range Size: 4 GB
 Physical Array Handle: 0x0023
 Partition Width: 2

Handle 0x0026, DMI type 20, 35 bytes
Memory Device Mapped Address
 Starting Address: 0x00000000000
 Ending Address: 0x000FFFFFFFF
 Range Size: 4 GB
 Physical Device Handle: 0x0024
 Memory Array Mapped Address Handle: 0x0025
 Partition Row Position: Unknown
 Interleave Position: 1
 Interleaved Data Depth: 1

Handle 0x0027, DMI type 21, 7 bytes
Built-in Pointing Device
 Type: Touch Pad
 Interface: PS/2
 Buttons: 2

Handle 0x0028, DMI type 22, 26 bytes
Portable Battery
 Location: I2C2
 Manufacturer: Intel SR 1
 Manufacture Date: Date
 Serial Number: 123456789
 Name: SR Real Battery
 Chemistry: Lithium Ion
 Design Capacity: 0 mWh
 Design Voltage: 3750 mV
 SBDS Version: CRB Battery 0
 Maximum Error: Unknown
 OEM-specific Information: 0x00000000

Handle 0x0029, DMI type 26, 24 bytes
Voltage Probe
 Description: Voltage Probe Description
 Location: <OUT OF SPEC>
 Status: <OUT OF SPEC>
 Maximum Value: Unknown
 Minimum Value: Unknown
 Resolution: Unknown
 Tolerance: Unknown
 Accuracy: Unknown
 OEM-specific Information: 0x00008000
 Nominal Value: 0.000 V

Handle 0x002A, DMI type 27, 15 bytes
Cooling Device
 Temperature Probe Handle: 0x002B
 Type: Chip Fan
 Status: OK
 OEM-specific Information: 0x00000000
 Nominal Speed: Unknown Or Non-rotating
 Description: Cooling Device Description

Handle 0x002B, DMI type 28, 24 bytes
Temperature Probe
 Description: Temperature Probe Description
 Location: Unknown
 Status: Unknown
 Maximum Value: Unknown
 Minimum Value: Unknown
 Resolution: Unknown
 Tolerance: Unknown
 Accuracy: Unknown
 OEM-specific Information: 0x00008000
 Nominal Value: 0.0 deg C

Handle 0x002C, DMI type 32, 11 bytes
System Boot Information
 Status: No errors detected

Handle 0x002D, DMI type 39, 22 bytes
System Power Supply
 Location: OEM Define 0
 Name: OEM Define 1
 Manufacturer: OEM Define 2
 Serial Number: OEM Define 3
 Asset Tag: OEM Define 4
 Model Part Number: OEM Define 5
 Revision: OEM Define 6
 Max Power Capacity: 75 W
 Status: Present, OK
 Type: Regulator
 Input Voltage Range Switching: Auto-switch
 Plugged: No
 Hot Replaceable: No

Handle 0x002E, DMI type 41, 11 bytes
Onboard Device
 Reference Designation: IGD
 Type: Video
 Status: Disabled
 Type Instance: 1
 Bus Address: 0000:00:02.0

Handle 0x002F, DMI type 131, 64 bytes
OEM-specific Type
 Header and Data:
  83 40 2F 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  00 00 00 00 00 00 00 00 76 50 72 6F 00 00 00 00

Handle 0xFEFF, DMI type 127, 4 bytes
End Of Table
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: justine 813 F.... pulseaudio
CasperMD5CheckResult: skip
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2021-03-29 (156 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0930:0225 Toshiba Corp. BCM43142A0
 Bus 001 Device 004: ID 13d3:5652 IMC Networks TOSHIBA Web Camera - HD
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: TOSHIBA SATELLITE C55-C
NonfreeKernelModules: wl
Package: linux (not installed)
ProcEnviron:
 LANGUAGE=fr_FR
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-81-generic root=UUID=5f061753-6856-40b4-8771-7c1fe0903b06 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-81-generic N/A
 linux-backports-modules-5.4.0-81-generic N/A
 linux-firmware 1.187.10
Tags: focal
Uname: Linux 5.4.0-81-generic x86_64
UnreportableReason: Ce rapport concerne un paquet qui n'est pas installé.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: False
dmi.bios.date: 09/15/2015
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 5.20
dmi.board.name: 06F5
dmi.board.vendor: FF50
dmi.board.version: Type2 - Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis ManuFacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: dmi:bvnINSYDECorp.:bvr5.20:bd09/15/2015:svnTOSHIBA:pnSATELLITEC55-C:pvrPSCP6E-01F03HFR:rvnFF50:rn06F5:rvrType2-BoardVersion:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion:
dmi.product.family: Type1 - Family
dmi.product.name: SATELLITE C55-C
dmi.product.sku: PSCP6E
dmi.product.version: PSCP6E-01F03HFR
dmi.sys.vendor: TOSHIBA

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1932332

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

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