screen brightness unchangable

[Ryan S]

Binary package hint: xorg

Hello, I am using a Gateway NV5927U laptop and the screen brightness is unchangeable via the keyboard controls. The brightness is stuck at 100% and changing values inside of /proc/acpi/video/GFX0 have no effect on the brightness. Please let me know what else you may need. If the brightness is changed inside of Microsoft Windows it will visually stay dim until GDM starts, at this point the screen raises to full brightness and is locked at that state.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic i686
Architecture: i386
Date: Mon Jul 19 00:19:36 2010
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100213)
Lsusb:
 Bus 002 Device 003: ID 04f2:b044 Chicony Electronics Co., Ltd
 Bus 002 Device 002: ID 8087:0020
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 002: ID 8087:0020
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Gateway NV59
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-23-generic root=UUID=2e6f02f8-a269-473e-bdab-905fc6eb70a3 ro processor.max_cstate=2 vga=0x317 quiet splash
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 11/26/2009
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: V1.09
dmi.board.name: NV59
dmi.board.vendor: Gateway
dmi.board.version: Rev
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Gateway
dmi.chassis.version: Rev
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.09:bd11/26/2009:svnGateway:pnNV59:pvrRev:rvnGateway:rnNV59:rvrRev:cvnGateway:ct10:cvrRev:
dmi.product.name: NV59
dmi.product.version: Rev
dmi.sys.vendor: Gateway
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-23-generic

[Sachin Garg (ascii79)]

http://bugzilla.kernel.org/show_bug.cgi?id=15513

I have logged the bug upstream

[Bryce Harrington (bryce)]

Looks like this was fixed by a kernel fix so refiling to linux.

workaround is available here:
http://marc.info/?l=linux-kernel&m=129018220313303&w=2
http://marc.info/?l=linux-kernel&m=129018215513192&w=2

[penalvch (penalvch)]

Ryan S, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please provide the information following https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Report_Minimum_Requirements ?

As well, could you please test for this with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the kernel in the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested and remove the tag:
needs-upstream-testing

This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the text:
needs-upstream-testing

If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested.

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER

Please let us know your results. Thank you for your understanding.

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[Hans Deragon (deragon)]

There might be some common problem with Bug #562005 (https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/562005).

[Chintana Prabhu (chintanarp98)]

similar bug https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/117327

[penalvch (penalvch)]

Chintana Prabhu, please _stop_ changing the Status and marking yourself assigned to reports without commenting to why this change should occur. For more on this, please see https://wiki.ubuntu.com/Bugs/Status .

[Po-Hsu Lin (cypressyew)]

Closing this bug with Won't fix as this kernel / release is no longer supported.
Please feel free to open a new bug report if you're still experiencing this on a newer release (Bionic 18.04.3 / Disco 19.04)
Thanks!