i945: can't get triple head to work

Julien Cristau jcristau at debian.org
Sat Jul 7 11:22:33 PDT 2007

On Sat, Jul  7, 2007 at 20:14:35 +0200, Tomasz Torcz wrote:

>   I can enable LVDS+VGA or LVDS+TV or VGA+TV. But when I have enabled
> two of them, enabling third do not work:
> (when LVDS and VGA are active)
> % xrandr --output TV --preferred
> xrandr: cannot find crtc for output TV
> (xrandr --auto yields same result).
> When LVDS and TV are active, messages says "xrandr: cannot find crtc for
> output VGA". Is this fixed in later version of driver?
The hardware has 2 crtcs, so if you want three outputs two of them have
to share a crtc, which I think means having the same mode.  The --crtc
option might help (or not..).  xrandr --verbose shows which outputs
can be assigned to which crtcs.


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