Bug 1268091

Summary:	Gnome backlight control prefers nv-backlight over intel-backlight on optimus systems
Product:	[Fedora] Fedora	Reporter:	javiertury
Component:	gnome-shell	Assignee:	Owen Taylor <otaylor>
Status:	CLOSED EOL	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	22	CC:	avi.kivity, desintegr, fmuellner, javiertury, otaylor, perry_yuan
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-07-19 18:05:16 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description javiertury 2015-10-01 19:34:58 UTC

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 18:05:16 UTC

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no longer maintained, which means that it will not receive any further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
bug.

Thank you for reporting this bug and we are sorry it could not be fixed.

Comment 2 Avi Kivity 2016-07-19 18:14:17 UTC

It's still broken in Fedora 24.