ati xrandr: cannot find crtc for output DVI-0

[Alex Deucher]

On 8/27/07, Jan Dittmer <jdi at l4x.org> wrote:
> Given ati driver 6.7.192 and libxrandr 1.2.1 (Debian experimental)
> I cannot enable the DVI-0 output using:
>
> $ xrandr --output DVI-0 --right-of VGA-0 --mode 1280x1024 --rate 60
> xrandr: cannot find crtc for output DVI-0
>

> $ xrandr -q
> Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 2560 x 1024
> VGA-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm
> x 301mm
>     1280x1024_60.00   60.0*+
>     1600x1024      60.0
>     1280x1024      59.9
>     1280x960       60.0
>     1280x800       60.0
>     800x600        56.2
>     640x480        60.0     59.9
> DVI-0 connected (normal left inverted right x axis y axis)
>     1280x1024      75.0     59.9     60.0
>     1152x864       75.0     74.8
>     1024x768       75.1     70.1     60.0
>     832x624        74.6
>     800x600        72.2     75.0     60.3     56.2
>     640x480        75.0     72.8     66.7     60.0
>     720x400        70.1
> S-video connected 800x600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
>     800x600        59.9*+   60.3

radeons only have two crtcs and you are trying to enable more an two
monitors.  you'll need to turn off S-video in order to turn DVI on.

xrandr --output S-video --off
xrandr --output DVI-0 --auto

If you don't have a tv plugged in than I'm guessing you probably have
an analog monitor on DVI-0 which is causing the tv to detect load (TV
and DVI port share the same dac).

Alex