ati xrandr: cannot find crtc for output DVI-0

[Jan Dittmer]

Alex Deucher wrote:
>> Hmmm... I haven't seen this myself, but I does remind me of a similar
>> problem we had years ago, that may have resurfaced with all the
>> refactoring of the driver.  I'll see if I can dig up what the solution
>> was.
> 
> I think perhaps disp_merge_cntl or disp2_merge_cntl is programmed
> wrong, (although I can't see how).  Can you dump the values of those
> regs using radeontool from git?
> 
> e.g.,
> radeontool regmatch DISP_MERGE_CNTL
> radeontool regmatch DISP2_MERGE_CNTL

After some grepping and patching:

$ sudo ./radeontool regmatch DISP2_MERGE_CNTL
DISP2_MERGE_CNTL (0d68) 0x00000000
$ sudo ./radeontool regmatch DISP_MERGE_CNTL
DISP_MERGE_CNTL (0d60)  0xffff0000

Jan