Bug 802071

Summary:	Brightness keys (Fn+Home and Fn+End) don't work on ThinkPad T61
Product:	[Fedora] Fedora	Reporter:	Miro Hrončok <mhroncok>
Component:	xorg-x11	Assignee:	X/OpenGL Maintenance List <xgl-maint>
Status:	CLOSED DEFERRED	QA Contact:
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	16	CC:	adrin.jalali, jskarvad
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-01-11 18:15:35 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Miro Hrončok 2012-03-10 18:31:33 UTC

Description of problem:
Brightness keys (Fn+Home and Fn+End) don't work on a ThinkPad T61 with Nvidia Quadro NVS 140M.

How reproducible:
The keys don't work with nouveau and don't work with kmod-nvidia.

Steps to Reproduce:
1. Hold Fn
2. Press Home or End
  
Actual results:
Nothing happens.

Expected results:
Screen brightness should change.

Additional info:
Echoing values between 0-15 to /sys/class/backlight/acpi_video0 works as expected.
The keys send XF86MonBrightnessUp and XF86MonBrightnessDown as expected.

Comment 1 Jaroslav Škarvada 2012-03-21 16:31:53 UTC

I think this is not xorg-x11 problem. AFAIK it is your desktop software who catch the brightness up/down events and controls the backlight through kernel interface, i.e. in Gnome it is the gnome-settings-daemon, in XFCE it is xfce4-power-manager. These daemons supports several interfaces. I think they prefer nv_backlight interface over acpi_video0 interface (if nouveau is used).

Comment 2 Adrin Jalali 2012-10-13 20:23:57 UTC

Okay, so what's the solution, I have the same problem here with F(17) latest updates up to this date.

Comment 3 Adrin Jalali 2012-10-13 20:38:32 UTC

I found something here:
http://forums.fedoraforum.org/showthread.php?t=276516

to add 
Option "RegistryDwords" "EnableBrightnessControl=1"
to the xorg.conf. It fixed my problem anyway.

Comment 4 Miro Hrončok 2013-01-11 18:15:35 UTC

My T61 is dead, so I'm closing this one, feel free to reopen, if someone else worry.