Bug 77266

Summary:	Display brightness adjustment not working with kernel 3.14 and Intel IvyBridge
Product:	DRI	Reporter:	Luca Viggiani <lviggiani>
Component:	DRM/Intel	Assignee:	Jani Nikula <jani.nikula>
Status:	CLOSED DUPLICATE	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	major
Priority:	medium	CC:	intel-gfx-bugs
Version:	XOrg git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Luca Viggiani 2014-04-10 11:46:43 UTC

After upgrading to linux 3.14 x86_64 on ArchLinux, using either the fn keys or the slider provided by gnome shell will not change the display brigthness on my Dell XPS 13 (L322X model) with Intel IvyBridge integrated vido card.

However, after executing the following command, the display brightness adjustments (nf key, slider menu etc) starts working again:

su -c "echo 0 > /sys/class/backlight/intel_backlight/brightness"

Comment 1 Luca Viggiani 2014-04-10 11:59:27 UTC

Booting with "video.use_native_backlight=1" boot paramenter, causes a weird behaviour:
Using the fn keys it now actually changes the display brigthness, however after that display brightness starts "bouncing" from 100% to value set by fn keys...
It will stop bouncing after issuing su -c "echo 0 > /sys/class/backlight/intel_backlight/brightness"

Comment 2 Jani Nikula 2014-04-10 12:15:44 UTC


*** This bug has been marked as a duplicate of bug 76276 ***

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