Bug 755685

Summary: Backlight contrl doesn't work on Lenovo laptop
Product: [Fedora] Fedora Reporter: Radek Vokal <rvokal>
Component: xorg-x11Assignee: X/OpenGL Maintenance List <xgl-maint>
Status: CLOSED WONTFIX QA Contact:
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 16CC: collura
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Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2013-02-26 10:14:54 EST Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
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Description Radek Vokal 2011-11-21 14:11:19 EST
Description of problem:
The backlight on the Lenovo laptop screen is set apx to 50%. It can't be lowered nor increased. 

xbacklight -set 100 - doesn't work either
function keys - shows only 50% progressbar, it won't get higher or lower

The laptop worked fine with F15. The GPU is Radeon mobility.

Version-Release number of selected component (if applicable):

Steps to Reproduce:
1. Try changing the backlight

Actual results:
Still same darkness

Expected results:
Comment 1 Radek Vokal 2011-11-21 14:12:37 EST
Created attachment 534840 [details]
Comment 2 Radek Vokal 2011-11-21 14:13:39 EST
Created attachment 534841 [details]
Smolt profile
Comment 3 Radek Vokal 2011-11-21 14:29:34 EST
Working with acpi directly works

[radek@localhost ~]$ ls /sys/class/backlight/*/brightness
[radek@localhost ~]$ cat /sys/class/backlight/acpi_video0/brightness
[radek@localhost ~]$ cat /sys/class/backlight/acpi_video0/max_brightness 
[root@localhost radek]#  echo 7 > /sys/class/backlight/acpi_video0/brightness
Comment 4 Fedora End Of Life 2013-01-16 16:00:43 EST
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Comment 5 Fedora End Of Life 2013-02-26 10:14:58 EST
Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 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no longer maintained, which means that it will not receive any further 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.