dualhead2go (analog) problem

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dualhead2go (analog) problem

Postby srankin1826 » Fri Feb 15, 2008 8:58 pm

I am using two 1280x1024 monitors connected to the VGA port on my thinkpad T61 via a Matrox DualHead2Go analog edition. This neat little box makes it appear to the T61 that instead of having 2 monitors attached, I have a single 2560x1024 monitor attached.

Some xorg.conf configuration was necessary to get it to boot into X properly (proper Modeline added). xrandr appears to work fine.

The problem is that when the mouse cursor goes beyond 2048 on the right of the screen, it wraps to the left of the screen. This is quite weird in that while the cursor appears to be wrapped onto the left side of the screen, it is functionally still on the right side of the screen.

Example: The log-off button is on the upper right corner of my dual display. When I move the cursor to the upper right of the screen, it visually appears to be near the middle of the left display, but when I click the left button, it brings up the log-off dialog.

I'm running Ubuntu 7.10 but have also tried live cd versions of xubuntu and opensuse. Same deal.

Can anyone offer any suggestions?

thanks,

Sam
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Re: dualhead2go (analog) problem

Postby srankin1826 » Tue Mar 04, 2008 11:52 pm

With some help on ubuntu forums, I was able to solve this. Solution here in case you need it:

xorg.conf -- added HW_cursor and SF_cursor options. I don't really know what they do. I just tried combinations until I got something that worked. Modelines takes from log files for my hardware. Your mileage may vary.

Code: Select all
Section "Device"
   Identifier   "Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller"
   Driver      "intel"
   BusID      "PCI:0:2:0"
   Option      "HW_cursor"   "off"
   Option      "SW_cursor"   "on"
EndSection

Section "Monitor"
   Identifier   "Generic Monitor"
   Option      "DPMS"
   Modeline "2560x1024mtx"  189.82  2560 2608 2720 2968  1024 1025 1037 1066 -hsync +vsync
   Modeline "1280x1024mtx"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync
   Modeline "1400x1050"  108.00  1400 1448 1560 1688  1050 1051 1054 1066 -hsync -vsync
#   Modeline "1400x1050"  89.97  1400 1448 1560 1688  1050 1051 1054 1066 -hsync -vsync
EndSection

Section "Screen"
   Identifier   "Default Screen"
   Device      "Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller"
   Monitor      "Generic Monitor"
   DefaultDepth   24
   SubSection "Display"
      Virtual      2800    2800
      Modes      "1400x1050" "2560x1024mtx" "2560x1024" "1280x1024mtx" "1280x1024" "1024x768" "800x600"
   EndSubSection
EndSection


cheers,

sam.rankin@gmail.com
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