Bug 9827 - S3: no backlight on resume - Fujitsu Lifebook T2010, i965 graphics
Summary: S3: no backlight on resume - Fujitsu Lifebook T2010, i965 graphics
Alias: None
Product: Power Management
Classification: Unclassified
Component: Hibernation/Suspend (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Zhang Rui
Depends on:
Blocks: 7216
  Show dependency tree
Reported: 2008-01-26 13:49 UTC by Ori Bernstein
Modified: 2008-04-02 01:42 UTC (History)
5 users (show)

See Also:
Kernel Version: 2.6.23
Regression: ---
Bisected commit-id:

acpidump output (168.68 KB, application/octet-stream)
2008-01-26 18:19 UTC, Ori Bernstein
lspci output (13.85 KB, application/octet-stream)
2008-01-26 18:20 UTC, Ori Bernstein
dmesg output (24.48 KB, text/plain)
2008-01-26 18:20 UTC, Ori Bernstein

Description Ori Bernstein 2008-01-26 13:49:17 UTC
Never worked with any kernels tested (2.6.22, 2.6.23)
Distribution: Debian Unstable
Hardware Environment: Fujitsu Lifebook T2010, i965 graphics.

Problem Description: After suspending, the backlight fails to resume in both
the raw console, and Xorg. There is more information available at this bug: 
http://bugs.freedesktop.org/show_bug.cgi?id=13709. The kernel exposes no backlight controls for this machine, and the X methods fail to bring back the backlight, with the exception of the native method iff I change the driver to make it default and I restart X after resume.

Steps to reproduce: "echo mem > /sys/power/state", hit the power button, and
note the screen is on, and everything but the backlight has resumed.

More information can be seen at: http://bugs.freedesktop.org/show_bug.cgi?id=13709
Comment 1 Fu Michael 2008-01-26 17:56:48 UTC
Ori, could you please attach:

1) output of acpidump
2) dmesg
3) lspci -vvxxx
Comment 2 Ori Bernstein 2008-01-26 18:19:03 UTC
Created attachment 14591 [details]
acpidump output
Comment 3 Ori Bernstein 2008-01-26 18:20:08 UTC
Created attachment 14592 [details]
lspci output
Comment 4 Ori Bernstein 2008-01-26 18:20:29 UTC
Created attachment 14593 [details]
dmesg output
Comment 5 Len Brown 2008-01-28 10:31:35 UTC
ACPI has no influence on backlight restore,
it is the job of the video driver, and failing that,
the BIOS; so I'm moving this sighting from ACPI/suspend
to PowerManagement/suspend

Please try the "s2ram" application, as it has a number
of workarounds for this issue built into it.
If s2ram doesn't know about this laptop, you can
try the workarounds manually.  They are listed in:
Comment 6 Alexander Clouter 2008-02-09 11:08:05 UTC
Erm...mine works fine with kernel 2.6.24.

Comment 7 Fu Michael 2008-02-13 22:13:44 UTC
Ori, can you verify as Alex said in comment# 6?
Comment 8 Zhang Rui 2008-04-02 01:42:23 UTC
Close this bug due to no response from the bug reporter.

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