[Bug 49747] dpms on only works on DP0 on a hd5700

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https://bugs.freedesktop.org/show_bug.cgi?id=49747

--- Comment #17 from Daniel Vetter <daniel@xxxxxxxx> 2012-05-10 13:58:04 PDT ---
Created attachment 61405
  --> https://bugs.freedesktop.org/attachment.cgi?id=61405
radeonregs dump after boot, DP1 broken

Somehow dpms off/on doesn't break things right now (I've only managed to once
create a strangely torn-in-half screen, never black and otherwise it just
worked). So I've fallen back to the always reliable switch-screen-off-and-on
and then forced a mode set with xrandr --off/--auto (which did not help).

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