I'm trying to enable the KDE 4.2.1 "desktop effects" using the new OpenGL support in VirtualBox 2.2. My guest is a KDE version of Fedora Core 10.
I've enabled 3D acceleration for the VM and set the video memory to 128MB. I've installed the latest VirtualBox Linux additions.
When I try to enable "desktop effects", I get the incredibly helpful message:
Failed to activate desktop effects using the given configuration options. Settings will be reverted to their previous values. Check you X configuration. You may also consider changing advanced options, especially changing the compositing type.
Changing the advanced options does not help.
My /etc/X11/xorg.conf file was dropped by VirtualBox, and only contains:
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Identifier "VirtualBox Video Card"
I've tried adding the following, but it doesn't help:
Looking through likely log files, I find the following in both /var/log/Xorg.0.log and /var/log/kdm.log:
(EE) AIGLX error: vboxvideo does not export required DRI extension
(EE) AIGLX: reverting to software rendering
Any ideas? This isn't an area I know anything about...
P.S. In case it's relevant, I have an nvidia card in my host machine.