Bug 4205 - S3 suspend: Backlight stays on - IBM Thinkpad X31
Summary: S3 suspend: Backlight stays on - IBM Thinkpad X31
Status: CLOSED INSUFFICIENT_DATA
Alias: None
Product: ACPI
Classification: Unclassified
Component: Power-Sleep-Wake (show other bugs)
Hardware: i386 Linux
: P2 normal
Assignee: Rafael J. Wysocki
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2005-02-13 03:25 UTC by Josef Gasteiger
Modified: 2007-04-28 12:49 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.11r4
Subsystem:
Regression: ---
Bisected commit-id:


Attachments

Description Josef Gasteiger 2005-02-13 03:25:26 UTC
Distribution: Debian Sarge
Hardware Environment: IBM Thinkpad X31 with radeon card
Software Environment: kernel 2.6.11r4
Problem Description: When going in S3 mode the display turns off for a second,
but then the backlight goes on again.
With kernel 2.6.10 the backlight stayed off.

Steps to reproduce: 
Here is the .config file: http://ro-wetter.dyndns.org/pics/.config2
Comment 1 Matthew Garrett 2005-02-13 16:04:24 UTC
Install vbetool (it's in Sarge now) and run vbetool dpms off at the end of your
suspend script.
Comment 2 Josef Gasteiger 2005-02-14 01:19:30 UTC
Thanks, but the backlight still goes on.

My script looks like this (hope that's what you meant):
...
vbetool dpms off
echo -n 3 > /proc/acpi/sleep
...
Comment 3 Rafael J. Wysocki 2006-09-28 16:25:45 UTC
Please reopen if the problem is still present in recent kernels (2.6.18 and later).
Comment 4 Pavel Machek 2006-09-29 03:59:48 UTC
Actually, the problem _is_ present with new kernels, but it is not kernel
problem. Either run radeontool to turn off backlight, or better install s2ram
from suspend.sf.net.

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