LVDS + VGA + TMDS-1

[Martin Spuetz]

Hello,

i have a Dell D630 with an Intel Chip:

00:02.0 VGA compatible controller: Intel Corporation Mobile Integrated
Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile Integrated Graphics
Controller (rev 0c)

Dual Head (17" TFT TMDS-1 or 17" TFT VGA and LVDS) works fine. But i
can't get triple head working.

Screen 0: minimum 320 x 200, current 1440 x 1024, maximum 2720 x 1024
VGA connected 1280x1024+0+0 (normal left inverted right) 338mm x 270mm
   1280x1024      60.0*+   75.0     59.9
   1280x960       74.9     59.9
   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
LVDS connected 1440x900+0+0 (normal left inverted right) 303mm x 190mm
   1440x900       60.0*+
   1360x768       59.8     60.0
   1280x800       60.0
   1152x864       60.0
   1280x768       60.0
   1280x720       60.0
   1024x768       60.0
   800x600        60.3
   640x480        59.9
TMDS-1 connected (normal left inverted right)
   1280x1024      60.0 +   59.9
   1024x768       60.0
   800x600        60.3
   640x480        60.0
   720x400        70.1
TV disconnected (normal left inverted right)

If I try:
$ xrandr --output TMDS-1 --auto
xrandr: cannot find crtc for output TMDS-1

Okay, I read [1]. As far as I understood, I have to share an crtc:

$ xrandr --output TMDS-1 --auto --crtc 0
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  156 (RANDR)
  Minor opcode of failed request:  21 ()
  Serial number of failed request:  18
  Current serial number in output stream:  18

Does my hardware support this or is it not possible?

If triple head is not possible, can I disable the internal LCD and use
dual head with DVI and VGA connected monitors?

Greetings,
Martin

[1] http://lists.freedesktop.org/archives/xorg/2007-July/026247.html