Bug 295462

Summary:	knotify4 using gstreamer as phonon-backend consumes CPU when idle
Product:	[Unmaintained] phonon-backend-gstreamer	Reporter:	Johann Höchtl <johann.hoechtl>
Component:	general	Assignee:	Harald Sitter <sitter>
Status:	RESOLVED FIXED
Severity:	major	CC:	johann.hoechtl, martin.sandsmark, myriam, romain.perier, tdfischer
Priority:	NOR
Version First Reported In:	4.5.1
Target Milestone:	4.6.1
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	4.6
Sentry Crash Report:

Description Johann Höchtl 2012-03-07 11:26:40 UTC

User-Agent:       Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:10.0.2) Gecko/20100101 Firefox/10.0.2
Build Identifier: 

knotify4 when using phonon gstreamer backend consumes way to much CPU cycles.

Reproducible: Always

Steps to Reproduce:
0. KDE 4.7.4 and upwards (possibly earlier versions)
1.System settings / Application and System Notifications: Player Settings: Assure, that "Use the KDE sound system" is ticked.
2.System settings / Multimedia / Phonon / Backend: Assure that GStreamer is the Phonon backend (here version 4.5.1.)
3.Open Terminal, run "top", let the system go idle. knotify4 is on top (using 2% CPU, speed dependent, of course)




3. Disabling sound notifications to "No audio output" (log out after setting) or using vlc as the phonon backend makes CPU usage go away.

Calling it a major bug as it consumes loads of CPU cycels for no good, causing thermal heat, dying laptop batteries and makes upcoming RC6 GPU sleep rather pointless for KDE gstreamer default installations.

Comment 1 Myriam Schweingruber 2012-03-08 11:10:22 UTC

The problem doesn't appear for me here, using the phonon-backend-gstreamer 4.6. Could you please upgrade and see if that still happens for you?

Using Kubuntu 12.04 beta1, KDE 4.8.1, Qt 4.8

Comment 2 Johann Höchtl 2012-03-08 13:43:20 UTC

I will have to wait until Kubuntu 12.04 is out. Or is there a way to test gstreamer backend V 4.6 on Kubuntu 11.10?

Comment 3 Myriam Schweingruber 2012-03-08 15:48:05 UTC

(In reply to comment #2)
> I will have to wait until Kubuntu 12.04 is out. Or is there a way to test
> gstreamer backend V 4.6 on Kubuntu 11.10?

Keep an eye on https://launchpad.net/~kubuntu-ppa/+archive/backports, they should backport it these days.

Comment 4 Johann Höchtl 2012-05-13 18:58:52 UTC

This bug does not persist any more with KDE 4.8.2 (as of Kubuntu 12.04)

Comment 5 Myriam Schweingruber 2012-05-16 08:22:25 UTC

Thank you for the feedback, closing then.