Bug 971910 - Brightness cannot be decreased from keys if it has minimum value on lenovo X230 Tablet
Brightness cannot be decreased from keys if it has minimum value on lenovo X2...
Product: Fedora
Classification: Fedora
Component: gnome-shell (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Owen Taylor
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-06-07 10:41 EDT by Marie
Modified: 2015-06-29 07:59 EDT (History)
6 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2015-06-29 07:59:29 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Marie 2013-06-07 10:41:54 EDT
Description of problem:
Brightness cannot be decreased from keys if it has maximum value

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

How reproducible:

Steps to Reproduce:
1. Start Fedora
2. Log in
3. Go to settings menu
4. set brightness to maximum
5. Press "FN"+F8 to set brightness to minimum (or from the settings menu)

Actual results:
Brightness is not decreased. Screen bar for brightness (settings menu) does not change

Expected results:
Brightness is decreased and the screen bar for brightness (Settings menu) changes according with brightness.

Additional info:
See on lenovo X230 Tablet, fedora 19 and Gnome version 3.8.2
I'm not sure that is gnome-shell that's responsible for this.
Comment 1 Philippe Coval 2013-06-07 12:59:07 EDT
Thank you

Please try again but force  acpi_osi="!Windows 2012" in the kernel boot line ...

Btw, Is there a Lenovo place to report Broken BIOS / ACPI issue ?

I dont know any beside their linux forum :


Comment 2 Fedora End Of Life 2013-09-16 10:07:21 EDT
This bug appears to have been reported against 'rawhide' during the Fedora 20 development cycle.
Changing version to '20'.

More information and reason for this action is here:
Comment 3 Fedora End Of Life 2015-05-29 05:06:14 EDT
This message is a reminder that Fedora 20 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 2015-06-29 07:59:29 EDT
Fedora 20 changed to end-of-life (EOL) status on 2015-06-23. Fedora 20 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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