Acer Aspire 5520 has backlight broken in Karmic Koala
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Medium
|
Stefan Bader |
Bug Description
I have seen reports of broken brightness control on the LKML (http://
When laptop is started, the backlight controls work properly (Fn+Left, Fn+Right) in the BIOS configuration screen, in GRUB and for some seconds during kernel initialization until:
[ 3.605030] usb 4-3: new full speed USB device using ohci_hcd and address 2
[ 3.690373] Linux agpgart interface v0.103
[ 3.698698] [Firmware Bug]: ACPI(Z00P) defines _DOD but not _DOS
[ 3.826220] usb 4-3: configuration #1 chosen from 1 choice
[ 4.232085] ACPI Error: Current brightness invalid 20090521 video-538
After these lines the controls stop working with "ACPI: Failed to switch the brightness" message.
The level of brightness stays on the same level it was before the ACPI error message until X starts when it goes down to 5% or so (it is not possible to reach this value using the controls, it is way too low, I am unable to figure the exact dependency but most of the time it is so).
Subsequent reboots do not make controls to work again so it is virtually not possible to see anything on the screen.
Sometimes it is possible to make screen brighter by switching to vt1-6, closing-opening the lid. Usually complete power-off and AC unplug-plug cycle is required to revert to original state.
ProblemType: Bug
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC268 Analog [ALC268 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC268 Analog [ALC268 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
Card0.Amixer.info:
Card hw:0 'NVidia'/'HDA NVidia at 0xd0880000 irq 21'
Mixer name : 'Realtek ALC268'
Components : 'HDA:10ec0268,
Controls : 12
Simple ctrls : 9
CheckboxSubmission: b16b943d4712f46
CheckboxSystem: 1fd1d69a420d766
Date: Sun Sep 13 17:22:09 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=
MachineType: Acer Aspire 5520
NonfreeKernelMo
Package: linux-image-
PccardctlIdent:
PccardctlStatus:
ProcCmdLine: root=/dev/
ProcEnviron:
SHELL=/bin/bash
PATH=(custom, user)
LANG=en_US.UTF-8
ProcVersionSign
RelatedPackageV
linux-
linux-firmware 1.16
SourcePackage: linux
Uname: Linux 2.6.31-10-generic i686
WpaSupplicantLog:
dmi.bios.date: 05/06/2008
dmi.bios.vendor: Acer
dmi.bios.version: V1.33
dmi.board.name: Fuquene
dmi.board.vendor: Acer
dmi.board.version: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.
dmi.modalias: dmi:bvnAcer:
dmi.product.name: Aspire 5520
dmi.product.
dmi.sys.vendor: Acer
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
status: | New → Triaged |
Changed in linux (Ubuntu): | |
assignee: | nobody → Stefan Bader (stefan-bader-canonical) |
status: | Triaged → In Progress |
Hi Roman,
Can you attach some additional debug information? Please run the following commands and attach the resulting "acpidump.txt" and "video.txt" file. Thanks!
sudo acpidump -o acpidump.txt
grep -r . /proc/acpi/video/ > video.txt