Bug 278611

Summary: Screen Brightness Control Doesn't Work on Nvidia Tegra 2 Device
Product: [Unmaintained] solid Reporter: rdnetto
Component: powermanagement-daemonAssignee: Dario Freddi <drf>
Status: RESOLVED FIXED    
Severity: normal CC: afiestas
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description rdnetto 2011-07-27 09:07:47 UTC 
Version:           unspecified (using KDE 4.6.2) 
OS:                Linux

When I press the keys mapped to Raise/Lower Monitor Brightness (in System Settings -> Shortcuts and Gestures -> Global Keyboard Shortcuts), nothing happens. There is no onscreen display (like for the volume keys) and the brightness doesn't change.

The same keys work under Gnome, and the brightness can be manually adjusted with 'echo 200 > /sys/devices/platform/pwm-backlight/backlight/pwm-backlight/brightness'.

Reproducible: Always

Steps to Reproduce:
Press the keys.

Actual Results:  
Nothing happens.

Expected Results:  
Screen brightness should change and an onscreen display indicate the change.

The device is an Asus Transformer, which uses the Nvidia Tegra 2 (ARM) chipset.
Discussed in forum here: http://forum.kde.org/viewtopic.php?f=66&t=96103
Comment 1 Alex Fiestas 2011-09-30 21:37:49 UTC 
This is already fixed at least in KDE 4.7.0

If you can reproduce it, please feel free to reopen the bug.

thanks!