Bug 8314

Summary:	Suspend-to-mem on MacBook destroys backlight control
Product:	ACPI	Reporter:	Mike Harris (atarimike)
Component:	Power-Sleep-Wake	Assignee:	Rafael J. Wysocki (rjwysocki)
Status:	REJECTED INSUFFICIENT_DATA
Severity:	normal	CC:	bunk, rjwysocki
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.21-rc6	Subsystem:
Regression:	---	Bisected commit-id:
Bug Depends on:
Bug Blocks:	7216
Attachments:	Kernel config Output of dmesg

Description Mike Harris 2007-04-08 20:56:32 UTC

Distribution: Fedora Core 6
Hardware Environment: MacBook Core Duo
Problem Description:
After resuming from a suspend-to-mem (echo "mem" > /sys/power/state), the 
backlight is set at maximum brightness.
When pbbuttonsd is running before the suspend, the backlight control no longer 
works after resume.
When pbbuttonsd is not running before the suspend, but started after a resume, 
it claims no backlight driver is available and backlight control does not 
work. This does not happen when pbbuttonsd is started on a "fresh" machine.

Comment 1 Mike Harris 2007-04-08 20:57:20 UTC

Created attachment 11108 [details]
Kernel config

Comment 2 Mike Harris 2007-04-08 20:58:47 UTC

Created attachment 11109 [details]
Output of dmesg

Comment 3 Adrian Bunk 2007-04-13 16:51:54 UTC

Is this already present in older kerenel like 2.6.20 or is it a regression?

Comment 4 Mike Harris 2007-04-14 04:38:09 UTC

Suspend hasn't worked correctly until 2.6.21-rc6, so it's a new bug.

Comment 5 Rafael J. Wysocki 2007-06-13 09:37:18 UTC

What's the current status of this bug?