Bug 230396

Summary: Screen brightness is not changed as expected by Powerdevil
Product: [Unmaintained] solid Reporter: Rafael <EagleScreen>
Component: powermanagement-daemonAssignee: Dario Freddi <drf>
Status: RESOLVED FIXED    
Severity: normal CC: unhammer+dill
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: unspecified   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Rafael 2010-03-12 01:32:20 UTC 
Version:           unknown (using 4.4.1 (KDE 4.4.1), Kubuntu packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.32-16-generic

Hello, I and some users have found this bug related to Powerdevil and screen brightness.
Laptops issually has got brightness keys to increase or decrease the screen brightness, when the respective key is pressed, an increment or decrement of screen brightness is expected.
What is happening?
When a brightness key is pressed, the Powerdevil applet slider is increased or decreased, but screen brightness is not changed.
If Powerdevil applet slider is moved directly with the mouse, the brightness is changed as expected.
This feature is working perfectly in Gnome and XFCE, what happens with KDE?
Comment 1 Kevin Brubeck Unhammer 2010-09-06 10:14:13 UTC 
I'm fairly sure I have the same problem, although I'm not 100% sure I read you correctly. Here's my situation:

If I mouseclick the powerdevil tray icon, I can change the brightness with the slider, everything works as expected.

If I press the "Brightness up" or "Brightness down" key, a slider pops up (looking sort of like the one which pops up when I press the "volume up/down" keys). Now, several things might happen depending on what brightness I already have set. 

If it's already set to 100% using the tray slider, nothing changes (on either key). The slider just stays onscreen for some seconds and then disappears.

At less than 100% but more than ~60%, both the up and down keys put it at somewhere around 60%. Pressing either key here has no effect. Moving it further below this point and then pressing either key will move it down to somewhere around 30%. Moving it below this point, either key puts it at around 20%, I'm not sure how many of these steps there are until 0%. 

I've never managed to make it brighter with either key.

At 0%, nothing changes, but I assume the slider shows up ;-) I have to "blindly" get it back up using the tray slider.

I've also tried remapping the keys to something like Ctrl+1 and Ctrl+2, I get the same results as when they are mapped to Brightness-up/Brightness-down.


Running Arch Linux, kdelibs 4.5.1-1 on an old Macbook.