[SOLVED] Some KDE desktop effects suddenly stopped working
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I've been running KDE 4.10.5 on Slackware64 14.0 for the last two or three months. Everything's been running perfectly. I have the standard set of KDE desktop effects enabled, and the only extravagance is wobbly windows.
Today, all of a sudden, Windows aren't wobbly anymore. There seems to be no way to re-enable the effect. KDE settings keep complaining that "7 desktop effects can't be enabled".
Some KDE desktop effects depend on having appropriate OpenGL support (Wobbly windows and Blur spring to mind).
Does 'glxinfo | grep OpenGL' show Nvidia in the vendor string?
Is 'Backend=OpenGL' shown in the Compositing section of kwinrc?
Got it! I had 'Backend=XRender'. I set it back to OpenGL, and now all my desktop effects are fully available again.
I think I know what happened. Yesterday I updated some packages on this machine, and there were some xorg-* packages in the set of patches. I started KDE, and then mysteriously VirtualBox crashed on startup. I thought this was a video driver related thing, and some components of my proprietary NVidia driver must have been squashed by the upgrade process. Switched to init 3, reinstalled the thing, and everything went, well, almost well. I guess KDE must have detected in the process that something's missing and must have reset the 'Backend' value.
You clearly don't have the same problem as the OP. You have no functioning OpenGL support, a 3 years old Mesa version, a different very old GPU, a different distribution and a different KDE version. So maybe you should open another thread?