Bug 322956

Summary:	Low OpenGl 3.1 performance on intel HD 4000
Product:	[Plasma] kwin	Reporter:	dgdanielf
Component:	scene-opengl	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UNMAINTAINED
Severity:	normal	CC:	kde.podagric, xaver.hugl
Priority:	NOR	Flags:	thomas.luebking: Intel+
Version:	4.10.95
Target Milestone:	---
Platform:	unspecified
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description dgdanielf 2013-07-29 17:53:26 UTC

I use OpenSuse 12.3 and installed the current version of KDE 4.11 (RC).
When I select OpenGL 3.1 shaders, then the framerate is reduced by ~50% when moving windows (from 60-70 to 25-30 fps). 
When I change any settings i.e. vblanc on or off (not dependent on the backend), I have the same behaviour but transiently, until I restart X11. 

Reproducible: Always

Steps to Reproduce:
1. Change Backend to OpenGL 3.1
2. Or change any settings until restart of X11
3.
Actual Results:  
Great Framerate drop

Expected Results:  
No Framerate drop

I have a HD4000, which I use for KDE 4.11 and i915 driver of Kernel 3.7.
I havent tested with any other cards so far..

Comment 1 dgdanielf 2013-07-29 18:04:40 UTC

Btw. XRender feels btw. also faster than any OpenGL backend, but FPS effect is not working with it (no fps displayed ==> why?).
What I noticed is, that when I move a windows which is rendering a OpenGL scene, than all OpenGL backends induces lags (0 fps for some ms) and the Fps is reduced all the movement long. 
With Xrender nothings happens (estimated 60 fps stable).

Comment 2 Thomas Lübking 2013-07-29 19:28:12 UTC

please attach the output of "qdbus org.kde.kwin /KWin supportInformation"

Comment 3 dgdanielf 2013-07-30 08:10:05 UTC

OpenGL: http://pastie.org/8189307

XRender: http://pastie.org/8189309

Comment 4 dgdanielf 2013-07-30 09:17:49 UTC

I reproduced the slowdown, when changing settings (which happens also with Xrender until restart) on a different PC where the OS is installed this time in a virtual box. Just try to move a window. It will be choppy..

Comment 5 Thomas Lübking 2013-07-30 09:33:52 UTC

Please don't mix up bugs.
The original bug was "OGL 3.1 is slow on ivybridge" (I can't really say, but the thing has only 16 shader units, so i'm not much surprised either)

Now you've choppy moving that initially only affected (all?!) OpenGL backends and now also XRender??

-> please ensure it's not related to the fps effect and then file a new bug for this.

Comment 6 Andrew Crouthamel 2018-11-10 03:24:05 UTC

Dear Bug Submitter,

This bug has been stagnant for a long time. Could you help us out and re-test if the bug is valid in the latest version? I am setting the status to NEEDSINFO pending your response, please change the Status back to REPORTED when you respond.

Thank you for helping us make KDE software even better for everyone!

Comment 7 Andrew Crouthamel 2018-11-21 04:30:30 UTC

Dear Bug Submitter,

This is a reminder that this bug has been stagnant for a long time. Could you help us out and re-test if the bug is valid in the latest version? This bug will be moved back to REPORTED Status for manual review later, which may take a while. If you are able to, please lend us a hand.

Thank you for helping us make KDE software even better for everyone!

Comment 8 Zamundaaa 2024-02-13 19:56:33 UTC

This bug report is definitely no longer relevant