Discussion:
Disable auto-detection of a specific monitor
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Maxence Sartiaux
2017-05-13 23:23:20 UTC
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Hello,

I'd like to know if there's a possibility to disable the auto-detection of a specific monitor / output.

I explain my case, i have three monitor & a KVM PCI-Passthrough setup for gaming.

When i start my vm i turn off my principal monitor via a libvirtd hook and it switch to windows.
My second screen have a KVM switch between arch GPU & Windows GPU
Third screen only on arch.


When i switch the KVM for the second screen, Xorg re-detect my primary screen and turn it On, but i can't see all my windows because the monitor is still switched on the Windows GPU.

My arch GPU is a GTX980 running on proprietary drivers.


Thank you

Have a good day.
Sean Greenslade
2017-05-18 19:08:26 UTC
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Post by Maxence Sartiaux
Hello,
I'd like to know if there's a possibility to disable the
auto-detection of a specific monitor / output.
I explain my case, i have three monitor & a KVM PCI-Passthrough setup for gaming.
When i start my vm i turn off my principal monitor via a libvirtd hook
and it switch to windows. My second screen have a KVM switch between
arch GPU & Windows GPU Third screen only on arch.
When i switch the KVM for the second screen, Xorg re-detect my primary
screen and turn it On, but i can't see all my windows because the
monitor is still switched on the Windows GPU.
My arch GPU is a GTX980 running on proprietary drivers.
You could write a script / set of scripts that issue the appropriate
xrandr commands to enable / disable that monitor output.

For example, I have the following bash aliases on my laptop to enable /
disable the VGA output:

alias extendvga='xrandr --output VGA1 --auto --right-of eDP1; xrandr --output eDP1 --primary'
alias retractvga='xrandr --output VGA1 --off'

--Sean

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