Public bug reported:
On an Acer Travelmate 8481TG using the default-config, the screen's
brightness can't be controlled (with Fn+cursor-key), altought the event
is recognized (and displayed in a popup in the upper right corner of the
screen).
With the kernel-parameter "acpi_backlight=vendor" the brightness-control
works (with Function-Key), but then another problem arises: When the
screen is switched of via DPMS (automatically after 10 minutes, or
manually with "xset dpms force off"), it can't be reactivated by moving
the mouse or pressing any key (as without acpi_backlight=vendor),
instead the screen has to be reactivated with the brightnes-control-keys
(which does not work while the screen is locked).
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-14-generic 3.0.0-14.23
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC271X Analog [ALC271X Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC271X Analog [ALC271X Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: misko 1757 F.... pulseaudio
CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xd3c00000 irq 45'
Mixer name : 'Realtek ALC271X'
Components : 'HDA:10ec0269,10250567,00100100'
Controls : 14
Simple ctrls : 9
Date: Wed Dec 21 23:11:30 2011
HibernationDevice: RESUME=UUID=d7575c4e-9a01-4e85-9867-c0dd51aedfed
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: Acer TravelMate 8481TG
ProcEnviron:
LANGUAGE=de_AT:de
PATH=(custom, no user)
LANG=de_AT.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-14-generic
root=UUID=f7b72e2b-e9bc-49a1-8b42-4e4f726f787a ro i915.i915_enable_rc6=1 quiet
splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.0.0-14-generic N/A
linux-backports-modules-3.0.0-14-generic N/A
linux-firmware 1.60
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
StagingDrivers: rts_pstor mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2011
dmi.bios.vendor: Acer
dmi.bios.version: V2.06
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: BA41_HS
dmi.board.vendor: Acer
dmi.board.version: Base Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.06
dmi.modalias:
dmi:bvnAcer:bvrV2.06:bd10/28/2011:svnAcer:pnTravelMate8481TG:pvrV2.06:rvnAcer:rnBA41_HS:rvrBaseBoardVersion:cvnAcer:ct10:cvrV2.06:
dmi.product.name: TravelMate 8481TG
dmi.product.version: V2.06
dmi.sys.vendor: Acer
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric running-unity staging
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https://bugs.launchpad.net/bugs/907555
Title:
Brightness-Troubles with Acer Travelmate 8481TG
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