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

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

--- Comment #7 from Alex Deucher agd5f@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