I can confirm this works as well, however it disables _all_ power management and makes the system run very hot as well as not suspending to RAM/hibernating. --Not a desirable solution for a laptop. I will try the latest upstream kernel to see if it helps with ACPI enabled.
Regards, Larry On Fri, Nov 4, 2011 at 9:06 PM, Alkis Georgopoulos <741...@bugs.launchpad.net> wrote: > > I filed this bug: http://www.acpica.org/bugzilla/show_bug.cgi?id=931 > and a bit later I read of a workaround in > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/518002 > which is to add "acpi_osi=Linux" in the kernel command line. > Then the brightness keys work, but there's no indicator popup window for the > brightness, which is no big deal. > > ** Bug watch added: www.acpica.org/bugzilla/ #931 > http://www.acpica.org/bugzilla/show_bug.cgi?id=931 > > -- > You received this bug notification because you are subscribed to the bug > report. > 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: > Confirmed > > 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 > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/741223/+subscriptions -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/741223 Title: Natty: Unable to adjust brightness for Acer Aspire 5731, requires reboot to reflect change To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/741223/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
