Dmitry Babrovich Dmitry.Babrovich at
Fri Sep 28 08:52:25 PDT 2007

As far as I understand you only have two pipes (look in your Xorg log to
see which one is assigned to which output), which are controled by crtc
parameter. You can have combinations of some outputs assigned to one
PIPE (for example VGA+LVDS on one and TMDS on the other) but I think it
would mean you'll get the same picture on the outputs assigned to the
same pipe. Look in intel's datasheet for more information - it's
awailable on their website.

Dmitry Babrovich

Software Engineer

Densitron Gaming Ltd  


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-----Original Message-----
From: xorg-bounces at
[mailto:xorg-bounces at] On Behalf Of Martin Spuetz
Sent: Friday, September 28, 2007 4:09 PM
To: xorg at
Subject: LVDS + VGA + TMDS-1


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?



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