Yay! It looks like xserver-xorg-video-ati 1:6.6.2-0ubuntu3 fixed the
problem:
* Fix radeon aperture size check that was causing hangs and crashes on
RN50, M6, M7 with 8/16/32(??) MBs of VRAM:
- 08_radeon_fix_aperture_size_check.diff
Thanks to Ben H., Dave Airlied and Michel Danzer for their constant
support.
-- Fabio M. Di Nitto <[EMAIL PROTECTED]> Tue, 03 Oct 2006 09:11:47
+0200
My xrandr stress test (toggling between dual-head and clone modes many
times in a row) failed to cause a freeze.
--
[dapper] xrandr freezes the system (radeon, MergedFB)
https://launchpad.net/bugs/47775
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