i945: can't get triple head to work

Eric Anholt eric at anholt.net
Sat Jul 7 11:20:07 PDT 2007

On Sat, 2007-07-07 at 20:14 +0200, Tomasz Torcz wrote:
> Hi,
>  I have a laptop with Intel chipset:
> 00:02.0 VGA compatible controller: Intel Corporation Mobile
> 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03)
>  I'm using Ubuntu with unofficial Intel driver version 2.0.0-1feisty1.
> xorg.conf is almost without any options, only "Virtual 2048 2048" is there.
> I've connected external LCD (via VGA) and TV and can't get them to work
> simultanously with built-in display.

>   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, as far as we understand, is incapable of doing what you
want here.  Each of those requires its own DPLL programming on a pipe,
and you've only got two pipes.

Eric Anholt                             anholt at FreeBSD.org
eric at anholt.net                         eric.anholt at intel.com

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