Public bug reported:
After recent updates (within the past couple of days), I'm no longer
able to set my screen brightness. Echoing numbers to
/proc/acpi/video/VID/LCD0/brightness results in the value of that file
being changed appropriately, as does plugging and unplugging my machine.
However, the screen brightness never actually changes. I haven't found
anything even remotely relevant in
/var/log/{syslog,kern.log,acpid,dmesg}.
My system is a Lenovo ThinkPad R61i running Intrepid. I'm currently
running kernel 2.6.27-11.27. I'm not certain I'm reporting this bug
against the correct package. Of the recent updates, there are three
possible candidates: gnome-power-manager is the least likely, since I'd
think that twiddling /proc settings is at a lower level than g-p-m.
Another candidate is acpi-support, but those updates came a bit too
early, I think, and they didn't appear to have anything to do with the
brightness setting. That leaves kernel updates which have been very
frequent the last several days.
My symptoms are very similar to those described in bug 198476, but since
that bug is fixed, and this is a recent regression, it's presumably not
the same bug.
ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
Package: linux-image-2.6.27-11-generic 2.6.27-11.27
ProcCmdLine: root=UUID=cf40ebf3-808f-4ab6-b7d9-52bf598a33b2 ro splash quiet
ProcEnviron:
PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.27-11.27-generic
SourcePackage: linux
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug
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No longer able to change screen brightness
https://bugs.launchpad.net/bugs/323475
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