[intrepid] proposed 2.6.27-11.22 kernel breaks t61 lcd brightness
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
High
|
Andy Whitcroft |
Bug Description
The kernel currently in intrepid-proposed, 2.6.27-11.22, causes the brightness settings on my lenovo t61 laptop to no longer work. Altering the LCD brightness settings while running the kernel in intrepid-updates, 2.6.27-10.20, does work.
One thing that's different between the two kernels is that in the -10.20 kernel, there are two directories under /proc/acpi/video/, VID/ and VID1/; however in the -11.22 kernel, only the VID/ directory exists. echo'ing data into /proc/acpi/
Writing values to the files under /sys/devices/
ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 8.10
Package: linux-image-
ProcCmdLine: root=UUID=
ProcEnviron:
PATH=/
LANG=en_US.UTF-8
SHELL=bash
ProcVersionSign
SourcePackage: linux
Changed in linux: | |
assignee: | nobody → apw |
status: | Triaged → In Progress |
Hi Steve,
I don't suppose you'd be willing to do a git bisect to help narrow down the patch? 2.6.27-11.21 pulled in the upstream 2.6.27.8 and 2.6.27.9 stable patch sets - bug 308761 . 2.6.27-11.22 pulled in the 2.6.27.10 stable patch set - bug 309731 . You might even want to just quickly test the 2.6.27-11.21 build to try to quickly narrow down which patch set to focus on - https:/ /edge.launchpad .net/ubuntu/ intrepid/ i386/linux- image-2. 6.27-11- generic/ 2.6.27- 11.21 . I'll post comments to bug 308761 and 309731 about this regression. Thanks.