CID: 201402-14810 Dell Vostro 20 3015
Brightness control does not work on this AIO system
The brightness level indicator would change with hotkey events, but the brightness itself does not.
Debugging information:
ubuntu@201402-14810:~$ ls /sys/class/backlight
acpi_video0 intel_backlight
ubuntu@201402-14810:~$ grep -r . /proc/acpi
/proc/acpi/wakeup:Device S-state Status Sysfs node
/proc/acpi/wakeup:XHC1 S4 *enabled pci:0000:00:14.0
/proc/acpi/wakeup:RP01 S4 *disabled pci:0000:00:1c.0
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP02 S4 *disabled
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP03 S4 *disabled pci:0000:00:1c.2
/proc/acpi/wakeup:PXSX S4 *disabled pci:0000:02:00.0
/proc/acpi/wakeup:RP04 S4 *disabled pci:0000:00:1c.3
/proc/acpi/wakeup:PXSX S4 *enabled pci:0000:03:00.0
/proc/acpi/wakeup:PWRB S4 *enabled
ubuntu@201402-14810:~$ dmesg | grep 'ACPI: Video'
[ 15.958744] ACPI: Video Device [PEGP] (multi-head: yes rom: yes post: no)
[ 15.960535] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
ubuntu@201402-14810:~$
ubuntu@201402-14810:~$ sudo showkey -k
kb mode was ?UNKNOWN?
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]
press any key (program terminates 10s after last keypress)...
keycode 28 release
keycode 225 press
keycode 225 release
keycode 225 press
keycode 225 release
keycode 224 press
keycode 224 release
keycode 224 press
keycode 224 release
^Ccaught signal 2, cleaning up...
ubuntu@201402-14810:~$
Keycode and scan code with brightness up / down key
ubuntu@201402-14810:~$ sudo showkey -s
kb mode was ?UNKNOWN?
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]
press any key (program terminates 10s after last keypress)...
0x9c
0xe0 0x54 0xe0 0xd4 0xe0 0x54 0xe0 0xd4
0xe0 0x4c 0xe0 0xcc 0xe0 0x4c 0xe0 0xcc
0x1d
^Ccaught signal 2, cleaning up...
ubuntu@201402-14810:~$
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-39-generic 3.13.0-39.66
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu 1597 F.... pulseaudio
CRDA:
country TW:
(2402 - 2472 @ 40), (3, 27)
(5270 - 5330 @ 40), (3, 17), DFS
(5735 - 5815 @ 40), (3, 30)
CurrentDesktop: Unity
Date: Mon Nov 24 02:41:31 2014
HibernationDevice: RESUME=UUID=944a1d0f-5400-4d20-a9f3-8b43d4ae02a1
InstallationDate: Installed on 2014-11-19 (4 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Vostro 20 3015
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=c241f0c7-88e6-435b-901f-35b094219306 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-39-generic N/A
linux-backports-modules-3.13.0-39-generic N/A
linux-firmware 1.127.8
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
dmi.bios.date: 02/18/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X13
dmi.board.name: Type2 - Board Product Name1
dmi.board.vendor: Dell Inc.
dmi.board.version: Type2 - Board Version
dmi.chassis.type: 13
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: X13
dmi.modalias: dmi:bvnDellInc.:bvrX13:bd02/18/2014:svnDellInc.:pnVostro203015:pvr:rvnDellInc.:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnDellInc.:ct13:cvrX13:
dmi.product.name: Vostro 20 3015
dmi.sys.vendor: Dell Inc.
Tweak:
acpi_backlight=
acpi_osi=\"!Windows 2012\" does not.