Bug 82301

Summary:	backlight sets to maximum when switching TTYs
Product:	Drivers	Reporter:	Igor Raits (igor.raits)
Component:	Video(DRI - Intel)	Assignee:	Daniel Vetter (daniel)
Status:	RESOLVED INVALID
Severity:	normal	CC:	alan, igor.raits, intel-gfx-bugs
Priority:	P2
Hardware:	All
OS:	Linux
Kernel Version:	kernel-3.16.0-1.fc21.x86_64	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	logs with drm.debug=0xe

Description Igor Raits 2014-08-13 10:32:10 UTC

Steps to reproduce:
1. set backlight to some value (through sysfs or any way)
2. switch to TTY

Actual results:
when TTY switched backlight setted to maximum value

Expected results:
when TTY switched backlight saved

Additional info:
I have only `intel_backlight`.

Comment 1 Igor Raits 2014-08-13 10:35:20 UTC

Created attachment 146421 [details]
logs with drm.debug=0xe

I can reproduce on X1 Carbon and on X230

Comment 2 Jani Nikula 2014-08-13 11:48:15 UTC

Seems to me the driver is setting exactly the backlight values requested by userspace.

Comment 3 Igor Raits 2014-08-21 22:38:31 UTC

Why invalid?

Comment 4 Alan 2014-08-22 11:45:33 UTC

The kernel is doing exactly what your userspace told it to so this would if anything be a distribution problem (probably in the X server)