Bug 8314

Summary: Suspend-to-mem on MacBook destroys backlight control
Product: ACPI Reporter: Mike Harris (atarimike)
Component: Power-Sleep-WakeAssignee: Rafael J. Wysocki (rjwysocki)
Severity: normal CC: bunk, rjwysocki
Priority: P2    
Hardware: i386   
OS: Linux   
Kernel Version: 2.6.21-rc6 Tree: Mainline
Regression: ---
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?