https://bugs.freedesktop.org/show_bug.cgi?id=34237
--- Comment #13 from Alex Deucher agd5f@yahoo.com 2011-02-15 09:45:54 PST --- (In reply to comment #12)
Wow. radeon.new_pll=0 solved the every 30 seconds flickering. I have running krandr in KDE4 and it doesn't flicker.
So this bug should be marked as solved?
Now I have to try Dave's drm-fixes (Which is another bug).
Thank you comio. Thank you Alex Deucher for that link. I'm gonna try it.
the new_pll option was removed in 2.6.37, so you probably just disabled kms. I'd recommend drm-fixes as it contains several pll fixes that should fix your problem.