http://bugs.freedesktop.org/show_bug.cgi?id=24611





--- Comment #14 from Pierre Ossman <[email protected]>  2009-11-29 
03:26:03 PST ---
Created an attachment (id=31547)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=31547)
radeon-crtc-off.patch

More testing has narrowed it down to the requirement that it's the mode
reconfiguration of the first CRTC that breaks something.

agd5f seems to remember that UMS disables unused CRTCs before configuring the
used one, the opposite of how KMS does it. This would explain why noone has
complained about this bug until now. Doing the same in KMS is not that trivial
though as it would mean reorganising the DRM layer.

Instead, we can copy the code which disables all active CRTCs before each
reconfiguration, and extend it to also disable the unused ones.


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