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Old 03-27-2013, 02:40 PM   #1
LQ Newbie
Registered: Oct 2009
Distribution: Slackware 13
Posts: 6

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Graphics acceleration works well for root, not so well for user

Hey all,

I use Slackware 14 32-bit with the latest FGLRX legacy driver. The installation went smoothly, no errors or warnings, during boot I'm told that the kernel modules are loaded, all fancy and good.

If I log into KDE with a root account, I don't experience any problems, all animations and effects are smooth. glxgears reports a spectacular 1000 FPS with effects switched on, and even 4-5 times more with effects switched off.

However, when I log into my user account, desktop effects become choppy, and OpenGL games/apps produce uselessly low framerates. glxgears keeps telling that I have 1000 FPS, but the wheels themselves show only ca. 1 frame per 5 seconds. Switching off desktop effects helps, but I'd prefer having the same smoothness as in the root account...

I'm already member of the 'video' group.

Do you have any idea what could be the problem?
Old 03-27-2013, 04:39 PM   #2
Registered: Dec 2002
Location: Au
Distribution: Debian
Posts: 209

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Check your X logs, there should be a clue in there.
Old 03-28-2013, 02:08 AM   #3
Registered: Mar 2010
Location: Russia
Distribution: Slackware64
Posts: 30

Rep: Reputation: 5
try add to your xorg.conf section

Section "DRI"
Mode 0666
and try enable debug mode for OpenGL
$ LIBGL_DEBUG=verbose glxinfo
Old 03-28-2013, 05:16 AM   #4
LQ Newbie
Registered: Oct 2009
Distribution: Slackware 13
Posts: 6

Original Poster
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Ok, I managed to solve it. It was as simple as switching KWin's composite mode from XRender to OpenGL

Thanks for the answers!


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