>But when I shutdown the computer it occasionaly hangs with radeon DRM errors
scrolling on the screen, and I have to use the button to shutdown.
Try this, can't remember where I found this from but I have a radeon card and
I had something radeon related wildly scrolling on screen at reboot or
shutdown but doing this fixed it:
sudo mv /etc/rc6.d/S35networking /etc/rc6.d/S15networking
sudo mv /etc/rc0.d/S35networking /etc/rc0.d/S15networking
sudo mv /etc/rc6.d/S31umountnfs.sh /etc/rc6.d/S05umountnfs.sh
sudo mv /etc/rc0.d/S31umountnfs.sh /etc/rc0.d/S05umountnfs.sh
If memory serves correctly it was about some race condition.