This version is no longer supported. If this is still reproducible on a
newer/supported version, please reopen.
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/741223
Title:
Natty: Unable to adjust brightness for Acer Aspire 5731, requires
reboot to reflect change
Status in linux package in Ubuntu:
Won't Fix
Bug description:
By default whatever the brightness is set to upon power-up/reboot is what
Ubuntu will use from GRUB on into the X session.
Reading through https://wiki.ubuntu.com/Kernel/Debugging/Backlight I
disassembled the ACPI BIOS info (per
https://wiki.ubuntu.com/BIOSandUbuntu#Buggy%20DSDT) and found entries for
changing the brightness and the correct entries for the display itself.
/sys/devices/virtual/backlight/acpi_video0 exists for controlling the
brightness but setting the values has no immediate effect on the brightness
although the values are saved. However, I have found that if I set
/sys/devices/virtual/backlight/acpi_video0/brightness to a specific value it is
used the next time the system is rebooted. There is no /proc entry for the
display adapter.
I am using the latest kernel for natty (2.6.38-020638rc8-generic
#201103081151) available and have tried the latest 2.6.37-X kernels without any
changes. I have been unable to try the mainline 2.6.38 kernel due to the
binutils change, preventing a clean compile.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xorg 1:7.6~3ubuntu11
Uname: Linux 2.6.38-020638rc8-generic x86_64
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
DRM.card0.DP.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.HDMI.A.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
DRM.card0.LVDS.1:
status: connected
enabled: enabled
dpms: On
modes: 1600x900
edid-base64:
AP///////wAGr54QAAAAAAESAQOAJhV4CkUlnFtVnCcZUFQAAAABAQEBAQEBAQEBAQEBAQEBICtAkGGEFDBAKjMAftYQAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTczUlcwMSBWMCAKALs=
DRM.card0.VGA.1:
status: disconnected
enabled: disabled
dpms: Off
modes:
edid-base64:
Date: Wed Mar 23 14:50:45 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus:
virtualbox-ose, 4.0.4, 2.6.38-6-generic, x86_64: installed
virtualbox-ose, 4.0.4, 2.6.38-7-generic, x86_64: installed
GraphicsCard:
Intel Corporation Core Processor Integrated Graphics Controller [8086:0046]
(rev 12) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device [1025:037e]
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
MachineType: Acer Aspire 7741
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-020638rc8-generic
root=UUID=d157ada1-7a4a-4f98-b97f-c162916f2f04 ro
crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
Renderer: Unknown
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/03/2010
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: V1.09
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Aspire 7741
dmi.board.vendor: Acer
dmi.board.version: V1.09
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.09
dmi.modalias:
dmi:bvnPhoenixTechnologiesLTD:bvrV1.09:bd05/03/2010:svnAcer:pnAspire7741:pvrV1.09:rvnAcer:rnAspire7741:rvrV1.09:cvnAcer:ct10:cvrV1.09:
dmi.product.name: Aspire 7741
dmi.product.version: V1.09
dmi.sys.vendor: Acer
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.23-1ubuntu5
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:0.0.16+git20110107+b795ca6e-0ubuntu6
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