Wednesday, November 4, 2009

Enabling laptop VGA output

The following commands enable VGA output (works presumably with any XOrg driver, tested with several ATI Radeon cards). It is especially useful if you want to make your laptop work with a projector connected with a damaged or long cable.
xrandr --newmode 1024x768N 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
xrandr --addmode VGA-0 1024x768N
xrandr --output LVDS --mode 1024x768
xrandr --output VGA-0 --mode 1024x768N
The first command adds a new 1024x768 (60Hz) video mode and names it: 1024x768N. The second command assigns the video mode to the VGA port (VGA-0). While the third and fourth commands switch the LCD display (LVDS) to 1024x768 mode and the VGA port to the newly created one respectively.

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