Bug 37662 - Upgrade to version 2.6.38, disable the laptop display back light
Summary: Upgrade to version 2.6.38, disable the laptop display back light
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - non Intel) (show other bugs)
Hardware: All Linux
: P1 blocking
Assignee: drivers_video-dri
URL: https://bugs.launchpad.net/null/+bug/...
Depends on:
Reported: 2011-06-16 16:34 UTC by njin
Modified: 2013-12-23 13:52 UTC (History)
3 users (show)

See Also:
Kernel Version: 2.6.38 - 3.0.0
Tree: Mainline
Regression: Yes

dmesg of 2.9.39-rc7 (246.48 KB, text/plain)
2011-06-16 16:34 UTC, njin

Description njin 2011-06-16 16:34:25 UTC
Created attachment 62272 [details]
dmesg of 2.9.39-rc7

No backlight after updates on Acer Aspire 5732Z
Comment 1 njin 2011-06-16 16:36:02 UTC
Additional files, if needed on the linked launchpad report.
Comment 2 Len Brown 2011-06-21 01:48:19 UTC
attachment is full of these:

WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_gart.c:176 radeon_gart_bind+0x1ab/0x1c0 [radeon]()

I don't see a linked launchpad report.

moving this bug to DRM.
Comment 3 njin 2011-06-21 16:30:44 UTC
@ Len Brown
Go up and below assigned to there's the launchpad URL, if this is not the right procedure, please advice me.
Comment 4 Gary Liddle 2011-08-06 10:42:14 UTC


I have the same laptop and have the same problem when i updated the Kernel.

I've been running which has no problems.

I initially updated to 2.6.38-8 which i thought at first had failed, but noticed the screen was only usable (and i use that word very lightly) in direct sunlight.

I've now updated to 2.6.38-10 which has the same problem as 2.6.38-8, no back light on the monitor.

I'm currently viewing the laptop on 2.6.38-10 through an external monitor so i can try to resolve the problem and can run any diagnostic commands you require.

Please see the above launchpad link for all the debug information regarding this problem.

Comment 5 Alan 2013-12-23 13:52:20 UTC
If this is still present in modern kernels please update the bug

Note You need to log in before you can comment on or make changes to this bug.