Bug 825838

Summary: Intel GM965/GL960: Changing screen brightness doesn't work and cause high CPU load
Product: [Fedora] Fedora Reporter: Roman Laube <roman.laube>
Component: xorg-x11-drv-intelAssignee: Adam Jackson <ajax>
Status: CLOSED WONTFIX QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 17CC: ajax, scottro11, xgl-maint
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Target Release: ---   
Hardware: i686   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2013-07-31 17:43:50 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Roman Laube 2012-05-28 16:47:05 UTC
Description of problem:
Changing screen brightness on MS-1221 (PR200) notebook with GM965/GL960 Intel graphics doesn't work properly - brightness goes down a bit and immediately raise back again. After this CPU load goes up, keyboard response goes down, system becomes unusable.


Version-Release number of selected component (if applicable): 
Fedora 17 KDE Live, Fedora 17, Fedora 16 KDE Live, Fedora 15 KDE Live

How reproducible:


Steps to Reproduce:
1.Boot Fedora 17 Live on MS-1221
2.Change brightness (via keyboard or via PowerManagement widget)
  
Actual results:
Brightness goes down a bit and immediately raise back again. After this CPU load goes up (Xorg process), keyboard response goes down, system becomes unusable.

Expected results:
Screen brightness changes

Additional info:
In Fedora 14 everything works fine.
After adding "acpi_backlight=vendor" as boot parametr, screen brightness doesn't work but system is stable.

Comment 1 Scott Robbins 2012-06-16 16:46:30 UTC
For what it's worth, I found that adding acpi_osi=   
(yes, just a blank after the equals) enabled me to use function keys to dim and brighten a Clevo laptop.  (The laptop had not let me use the function keys, nor did any desktop environment on several distributions let me change the brightness.

I actually found that solution on a 4 year old Ubuntu forum thread.

Comment 2 Roman Laube 2012-06-19 04:13:49 UTC
(In reply to comment #1)
> For what it's worth, I found that adding acpi_osi=   
> (yes, just a blank after the equals) enabled me to use function keys to dim
> and brighten a Clevo laptop.  (The laptop had not let me use the function
> keys, nor did any desktop environment on several distributions let me change
> the brightness.
> 
> I actually found that solution on a 4 year old Ubuntu forum thread.


Hello,
I have tried your hint, but no success...

Comment 3 Fedora End Of Life 2013-07-03 19:21:33 UTC
This message is a reminder that Fedora 17 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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Comment 4 Fedora End Of Life 2013-07-31 17:43:54 UTC
Fedora 17 changed to end-of-life (EOL) status on 2013-07-30. Fedora 17 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
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Thank you for reporting this bug and we are sorry it could not be fixed.