Bug 9827

Summary:	S3: no backlight on resume - Fujitsu Lifebook T2010, i965 graphics
Product:	Power Management	Reporter:	Ori Bernstein (ori)
Component:	Hibernation/Suspend	Assignee:	Zhang Rui (rui.zhang)
Status:	REJECTED INSUFFICIENT_DATA
Severity:	normal	CC:	acpi-bugzilla, bunk, mattst88, rpurdie, sergio
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.23	Subsystem:
Regression:	---	Bisected commit-id:
Bug Depends on:
Bug Blocks:	7216
Attachments:	acpidump output lspci output dmesg output

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:
Documentation/power/video.txt

Comment 6 Alexander Clouter 2008-02-09 11:08:05 UTC

Erm...mine works fine with kernel 2.6.24.

http://www.digriz.org.uk/debian-fujitsu-t2010

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.