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-x11Assignee: X/OpenGL Maintenance List <xgl-maint>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 16CC: adrin.jalali, jskarvad
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2013-01-11 13:15:35 EST Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Miro Hrončok 2012-03-10 13:31:33 EST
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 12:31:53 EDT
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 16:23:57 EDT
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 16:38:32 EDT
I found something here:

to add 
Option "RegistryDwords" "EnableBrightnessControl=1"
to the xorg.conf. It fixed my problem anyway.
Comment 4 Miro Hrončok 2013-01-11 13:15:35 EST
My T61 is dead, so I'm closing this one, feel free to reopen, if someone else worry.