https://bugs.freedesktop.org/show_bug.cgi?id=27816

--- Comment #7 from Alex Deucher <[email protected]> 2010-04-23 11:53:17 PDT ---
The dynpm stuff is disabled when you have multiple heads active as it needs to
change the clocks during the vertical blanking interval to avoid graphical
glitches.  With two heads, your blanking intervals are rarely if ever aligned.

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