Dual-monitor + TV

In the current GNOME shell, Xinerama, the feature that supports more than 2 adjacent displays, is broken.  With my nVidia card, the native Nouveau driver doesn’t even detect the 3rd output.  The proprietary nVidia driver detects 3 outputs, but cannot enable all of them simultaneously, even without Xinerama (ie, as separate X displays).  🙁  So it’s either dual-monitor, or TV; no triple-monitor.

Luckily, nVidia supports some xrandr features, so I was able to write a script to switch from dual-monitor to monitor+TV clone and back:


if xrandr -q | egrep '^VGA-0 .+ 410mm' >/dev/null 2>&1
  echo Turning TV on...
  xrandr --output VGA-0 --off
  xrandr --output TV-0 --auto --scale 1.172x1.172 --same-as DVI-I-1 --primary
  echo Turning TV off...
  xrandr --output TV-0 --off
  xrandr --output VGA-0 --auto --scale 1x1 --right-of DVI-I-1

Modify this script to suit your system settings with the correct outputs and scaling.  A corresponding *.desktop file adds this script to my dash:

[Desktop Entry]
Name=Turn TV On/Off

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