Public bug reported:
I have seen reports of broken brightness control on the LKML
(http://patchwork.kernel.org/patch/43618/ - code is alredy present in
running kernel) and in Launchpad (LP#333386 - had no problems in 9.04 on
all kernel updates), and looks like something was fixed. However, up-
to-date Ubuntu 9.10 alpha cannot be normally used with Acer Aspire 5520.
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/controlC0: rtg 3996 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'NVidia'/'HDA NVidia at 0xd0880000 irq 21'
Mixer name : 'Realtek ALC268'
Components : 'HDA:10ec0268,10250126,00100003
HDA:14f12c06,10250126,00100000'
Controls : 12
Simple ctrls : 9
CheckboxSubmission: b16b943d4712f4613c50f12b0ffe0cc5
CheckboxSystem: 1fd1d69a420d7665c5bbb30cf0881c53
Date: Sun Sep 13 17:22:09 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=b7013d50-c260-43e4-9f02-9b2bc8e97430
MachineType: Acer Aspire 5520
NonfreeKernelModules: nvidia
Package: linux-image-2.6.31-10-generic 2.6.31-10.32
PccardctlIdent:
PccardctlStatus:
ProcCmdLine: root=/dev/mapper/vg00-root ro quiet splash
crashkernel=384M-2G:64M,2G-:128M
ProcEnviron:
SHELL=/bin/bash
PATH=(custom, user)
LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-10.32-generic
RelatedPackageVersions:
linux-backports-modules-2.6.31-10-generic N/A
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.version: N/A
dmi.modalias:
dmi:bvnAcer:bvrV1.33:bd05/06/2008:svnAcer:pnAspire5520:pvrV1.33:rvnAcer:rnFuquene:rvrN/A:cvnAcer:ct10:cvrN/A:
dmi.product.name: Aspire 5520
dmi.product.version: V1.33
dmi.sys.vendor: Acer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
Acer Aspire 5520 has backlight broken in Karmic Koala
https://bugs.launchpad.net/bugs/428910
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