i'm using lucid with the latest bits from xorg-edgers. Since 2.6.33rc* (i can't seem to recall exactly where it started) the HDMI output turns off (both video&sound) after exactly 10 minutes. 2.6.34rc1 has the same issue. If I press Alt+F1 and then go back to F7, display comes back for another 10 minutes (moving the mouse/pressing keys won't help).
If i turn kms off (boot option radeon.modeset=0) everything works fine.
Anyone else having this issue?
lspci -v |grep VGA
01:05.0 VGA compatible controller: ATI Technologies Inc RS880 [Radeon HD 4200]