Today I did a few tests more, and finally got best results with KMS
enabled. Now I have working X server with DRI2, 3D acceleration and
really fast switching between VTs and X desktop. 3D performance is worse
than it was before with DRI, but I have no issues when powering down
(previously was: red&white artifacts, system hangs) and didn't
experience either black screen or high CPU usage after startup :)
You can easy test KVM without restarting, just stop gdm and reload
radeon driver with option modeset=1, then start gdm again.
sudo stop gdm
sudo modprobe -r radeon
sudo modprobe radeon modeset=1
sudo start gdm
To enable KVM automatically I use modified Cyril's method (just added
modeset=1):
...
initctl emit starting-dm DM=gdm
# 3D acceleration FIX: re-init of radeon driver (should be loaded AFTER agpgart
kernel module); enable KVM
modprobe -r radeon ; modprobe radeon modeset=1
exec gdm-binary $CONFIG_FILE
--
Radeon module loaded before agpgart
https://bugs.launchpad.net/bugs/468413
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