Created attachment 86825 [details]
dmesg when under works due to setting .debug=1

I tried again with the latest rc3 build and it still doesn't work; I had left
changes from comment 94 intact.  Trying to get more information I tried booting
with radeon.modeset=0 radeon.debug=1.  Once I re-loaded the module with dpm,
now it works!  So it works correctly if you set it to debug mode, otherwise I
can't get any logs of the event.  

This is the dmesg from when it worked (with debug on).  I noticed there are
some HDMI errors; I only have DVI actually hooked up.