4.6.2 update killed compositing

[lykwydchykyn]

I just updated my maverick install from 4.6.1 to 4.6.2 this morning, and since the upgrade I have no compositing support. Trying to enable it leaves this error in the .xsession-error log:

kwin(2773) KWin::Workspace::setupCompositing: KWin has detected that your OpenGL library is unsafe to use, falling back to XRender. 
kwin(2773): Failed to initialize compositing, compositing disabled 
kwin(2773): Consult [url]http://techbase.kde.org/Projects/KWin/4.0-release-notes#Setting_up[/url]

I've tried to enable support, but it won't enable. The systemsettings tool says "Desktop effects are not available on this system due to the following technical issues: " and then gives no issues.

My video is a geForce 8400 GS with dual monitors, I've used it for years with KDE4 and had no problems with compositing until now.

Anyone have any advice?

EDIT: I should add that I can get partial compositing by switching from opengl to xrender, but I lose most of my effects.

Also, no matter what settings I use, the list of effects comes up blank. No effects are listed at all.

[schnelle]

Re: 4.6.2 update killed compositing

You can try with deleting kwinrc configuration file in ~/.kde/share/config. Then Alt+F2 and type "kwin --replace". That way you will be back to default kwin settings. Maybe your kwinrc got corrupted during upgrade.

[sithlord48]

Re: 4.6.2 update killed compositing

you don't even need to remove the whole file you can edit it and change lines like

OpenGLunsafe=true to OpenGLunsave=false

you might have also put ur gpu on the blacklist for some effects, those will be up toward the top of the file. this is not uncommon i have seen it happen a few times, and it seams to happen more often the properitary driver.

if your at all worried about manually editing the file then just remove it

[code=run in konsole]
rm ~/.kde/share/config/kwinrc
[/code]
after that you will need to log out and back in or restart kwin as described above.

[lykwydchykyn]

Re: 4.6.2 update killed compositing

OpenGLunsafe=false

That did the trick, many thanks. I was poking around at kwinrc and wasn't sure what that would do.

I had to edit the file while kwin was not running, but after changing that (and changing renderer back to OpenGL, I have all my effects (and old bugs) back.

Kind of a shame Xrender loses some effects, it ran better in some ways.

Thanks for the help.

PS -- as a general best practice, I would not recommend to anyone to DELETE a config file, it's better to move it or rename it, in case imporant settings get lost.

[sithlord48]

Re: 4.6.2 update killed compositing

that file only controls your effects, its 100% safe to delete.