To help with setting up multi-monitor X I'm using a simple script to get screen resolution information using
xrandr. This was working fine until I tried attaching an amplifier to attempt to use HDMI audio output. Now the
xrandr output contains extraneous information about a monitor which is not present. Is there some way to avoid
xrandr detecting this device as another monitor? The device is an Onkyo TX-NR509.
An obvious workaround is to detach the amplifier every time I start X.