Bug 334935

Summary:	Can't change laptop brightness
Product:	[Frameworks and Libraries] frameworks-solid	Reporter:	AnAkkk <anakin.cs>
Component:	general	Assignee:	Alex Fiestas <afiestas>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kdelibs-bugs, sebas
Priority:	NOR
Version:	5.1.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Attachments:	plasmaengineexplorer console output

Description AnAkkk 2014-05-17 10:24:26 UTC

My brightness keys work fine under KDE 4.13, but not with Plasma Next. The battery monitor says: "No screen of keyboard brightness controls available".
Changing it through a terminal works fine.

I'm on ArchLinux with the -git packages from AUR. 

Reproducible: Always

Comment 1 Kai Uwe Broulik 2014-05-17 11:55:07 UTC

The PowerDevil infrastructure for brightness handling is not yet ready for Plasma Next.

Comment 2 Sebastian Kügler 2014-05-20 00:17:39 UTC

Correction: powerdevil is there. :) I've both display and keyboard brightness support in the battery applet.

AnAkkk: Could you try installing powerdevil? If that doesn't solve your problem, or you already have it, please reopen this bugreport.

Comment 3 AnAkkk 2014-05-20 08:28:54 UTC

powerdevil is already installed.

Comment 4 Sebastian Kügler 2014-05-20 10:54:47 UTC

AnAkkk: Have you logged out and back in again after installing powerdevil? I assume it worked just fine in Plasma 4.x?

Could you install plasmate, and start 

plasmaengineexplorer --engine powermanagement

Then post a screenshot of what's shown (tree expanded, please), and the console output that plasmaengineexplorer prints.

Thanks for helping with debugging this!

Comment 5 AnAkkk 2014-05-20 11:06:08 UTC

Created attachment 86732 [details]
plasmaengineexplorer

Yes, I've already logged out and back in, and restarted my computer many times since. Everything works fine in Plasma 4.x.

Comment 6 AnAkkk 2014-05-20 11:06:34 UTC

Created attachment 86733 [details]
console output

Comment 7 Sebastian Kügler 2014-05-20 11:26:35 UTC

Ok, the Plasma bits seem good here. I'm reassigning this to Solid, as the problems comes from an underlying library.

Comment 8 AnAkkk 2014-06-10 18:06:23 UTC

I can now change the brightness through the battery applet. The keys still don't work though.

Comment 9 AnAkkk 2014-06-27 19:35:17 UTC

And now after updating some of the git packages it stopped working in the battery applet again.

Comment 10 AnAkkk 2014-08-30 15:41:47 UTC

Anyone here?

The errors I have now:
dbus[549]: [system] Activating service name='org.kde.powerdevil.backlighthelper' (using servicehelper)
org.kde.powerdevil.backlighthelper[822]: Helper initialization failed
dbus[549]: [system] Activated service 'org.kde.powerdevil.backlighthelper' failed: Launch helper exited with unknown return code 255

This is still on Arch Linux. I've tested on a Kubuntu Live CD and it works fine though. Any ideas?

Comment 11 AnAkkk 2014-08-31 18:03:26 UTC

Fixed by rebuilding all packages to be in /usr rather than /opt/kf5.