Ubuntu
linux package

2.6.27-11 regression with LCD brightness on T61 thinkpad

Bug #315198 reported by Aaron Kurtz on 2009-01-08

This bug report is a duplicate of: Bug #311716: The slider brightness Applet has value inverted after the last update (2.6.27-11). Edit Remove

Affects		Status	Importance	Assigned to	Milestone
	linux (Ubuntu)	New	Undecided	Unassigned

Bug Description

This is not https://bugs.launchpad.net/ubuntu/+source/linux/+bug/280646 - gnome-power-manager is upgraded to 2.24.0-0ubuntu4, and I never use numlock anyways. It sounds a lot like https://bugs.launchpad.net/ubuntu/+source/linux/+bug/198476 another regression that was fixed.

Anyways, I'm using ubuntu-proposed as it has iwlagn upgrades, but upgrading to 2.6.27-11 from 2.6.27-9 broke changing the LCD brightness.

When I boot into -9, I can update brightness with the Fn+Home/End keys properly.

When I boot into -11, pressing the keys pops open the brightness OSD, but it's very laggy, and it doesn't do anything to the screen.

When I go to /proc/acpi/video/VID/LCD0/brightness I can see that the value is being modified, but the screen doesn't change at all.

T61 14.1" with GM965/GL960 chipset.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
Package: linux-image-2.6.27-11-generic 2.6.27-11.22
ProcCmdLine: root=/dev/mapper/hostname-root ro quiet splash
ProcEnviron:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.27-11.22-generic
SourcePackage: linux

Tags:

Revision history for this message

Aaron Kurtz (a.kurtz) wrote on 2009-01-08:

BootDmesg.txt Edit (47.6 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (3.6 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (1.0 KiB, text/plain; charset="utf-8")
HalComputerInfo.txt Edit (2.7 KiB, text/plain; charset="utf-8")
LsUsb.txt Edit (590 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (15.7 KiB, text/plain; charset="utf-8")
ProcCpuInfo.txt Edit (1.3 KiB, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.3 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (5.1 KiB, text/plain; charset="utf-8")

Revision history for this message

Leann Ogasawara (leannogasawara) wrote on 2009-01-09:

Hi Aaron,

This is actually a duplicate of bug 311716 so I am marking it as such. Please continue to track this issue at that report. A kernel with a possible fix was uploaded to intrepid-proposed if you wanted to test - https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/311716/comments/11 . But again, please provide any feedback in bug 311716. Thanks.