Bug 1268091 - Gnome backlight control prefers nv-backlight over intel-backlight on optimus systems
Gnome backlight control prefers nv-backlight over intel-backlight on optimus ...
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: 2015-10-01 15:34 EDT by javiertury
Modified: 2016-07-19 14:14 EDT (History)
6 users (show)

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Doc Type: Bug Fix
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Last Closed: 2016-07-19 14:05:16 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description javiertury 2015-10-01 15:34:58 EDT
Description of problem

When changing the brightness level on gnome-shell it has no effect on the screen backlight.

Gnome by default adjusts the value of "/sys/class/backlight/nv_backlight/brightness" when it should adjust the value of "/sys/class/backlight/intel_backlight/brightness" as the intel card handles the output.

The default behaviour is understandable for desktops but it doesn't work for laptops.

Additional notes

* The system is an optimus laptop, it consists of 2 graphic cards where the intel one handles all the output.

* Only open source drivers, i915 and nouveau, are used.

* PRIME is used to switch cards, not bumblebee.

* While changing the brightness on gnome's slider or using the hotkeys the file "/sys/class/backlight/nv_backlight/brightness" changes too.

* xbacklight works fine, it changes intel_backlight only.
Comment 1 Fedora End Of Life 2016-07-19 14:05:16 EDT
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 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no longer maintained, which means that it will not receive any further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
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this

Thank you for reporting this bug and we are sorry it could not be fixed.
Comment 2 Avi Kivity 2016-07-19 14:14:17 EDT
It's still broken in Fedora 24.

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