Bug 755685 - Backlight contrl doesn't work on Lenovo laptop
Backlight contrl doesn't work on Lenovo laptop
Product: Fedora
Classification: Fedora
Component: xorg-x11 (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: X/OpenGL Maintenance List
Depends On:
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Reported: 2011-11-21 14:11 EST by Radek Vokal
Modified: 2013-02-26 10:14 EST (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2013-02-26 10:14:54 EST
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Xorg.0.log (63.85 KB, text/plain)
2011-11-21 14:12 EST, Radek Vokal
no flags Details
Smolt profile (2.60 KB, text/plain)
2011-11-21 14:13 EST, Radek Vokal
no flags Details

  None (edit)
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
This message is a reminder that Fedora 16 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 16. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '16'.

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to a later Fedora version prior to Fedora 16's end of life.

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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.

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