Dell OptiPlex 980, Radeon HD 4550 xorg figures it should use the r500 driver.
I start with no /etc/X11/xorg.conf. It comes up, mirroring. I use the
gnome applet - the same thing, btw, with system-config-display - tell it
to use dual head, and spanning desktops. Exit X.
Restart, and the second monitor goes into powersave mode. Try to exit X,
either via logout, or <ctrl><alt><bkspace>, and it goes, and comes back
with a bluish screen... and that's all she wrote. It's hung so hard I
can't log in via ssh, and have to power cycle it.
Any clues?
mark