Confirmed with ATI Radeon 9600XT on an older Athlon XP PC.
After a few minutes with composing (effects) enabled either:
1) screen and keybord freeze; or
2) the above with the screen also going black; or
3) the above with the screen going black but a cursor present
in the last case (and only in that) it is possible to reboot the machine with ctrl-alt-del.
System was showing a similar (but minor issue) also with the free radeon drivers on intrepid (Xorg going in an infinite loop), but in that case the system remained responsive from the network.
System was otherwise stable with the fglrx drivers (apart from X crashing on some opengl screensavers).
Confirmed with ATI Radeon 9600XT on an older Athlon XP PC.
After a few minutes with composing (effects) enabled either:
1) screen and keybord freeze; or
2) the above with the screen also going black; or
3) the above with the screen going black but a cursor present
in the last case (and only in that) it is possible to reboot the machine with ctrl-alt-del.
System was showing a similar (but minor issue) also with the free radeon drivers on intrepid (Xorg going in an infinite loop), but in that case the system remained responsive from the network.
System was otherwise stable with the fglrx drivers (apart from X crashing on some opengl screensavers).