https://bugs.freedesktop.org/show_bug.cgi?id=34237
--- Comment #11 from Alex Deucher agd5f@yahoo.com 2011-02-15 09:20:54 PST --- I think there may be several different issues here: 1. blinking when probing displays 2. unstable display all the time
If you have an unstable display all the time, please try Dave's drm-fixes kernel tree: http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=shortlog;h=r...
If you just have display problems when probing the displays (either manually with xrandr or polling by kde) you'll need to disable the polling.