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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #7 from Alex Deucher <agd5f at yahoo.com> 2012-05-10 13:12:51 PDT ---
(In reply to comment #6)
> The driver correctly lights up the display on DP1 after boot, it only
> fails after the first dpms off. The dmesg/xrandr is after I've done a
> dpms cycle, i.e. black DP1 output. So nothing in there.

Does an full off/on modeset cycle bring it back?

> 
> Should I regrab dmesg after a dpms cycle with more verbose logging?

I figured maybe link training was failing.  Can you dump the registers before
and after the dpms cycle with radeonreg
(http://cgit.freedesktop.org/~airlied/radeontool/)?

radeonreg regs dce4

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