Re: Virtual machine affects client screen resolution
On Fri 17 Feb 2023 at 20:57:38 (-0500), Albert S. wrote:
> Running “xrandr --size 800x600” on a virtual machine affected both
> monitors on my workstation. That was completely unexpected and I am
> wondering how to explain that.
>
> Below you will find the detailed description.
[ … ]
> But my real concern is how a xrandr command issued on a VM which is
> running on another machine could affect the video of the client
> machine used to access that VM.
>
> I would appreciate an explanation for that.
The clue is in your use of the word "client". In fact, the "video of
the machine used to access that VM" is the X /server/. The
applications that you control on this machine, and others that you
connect to, which you thought were servers, are in fact the clients.
So, for example, I'm sitting at my All-in-One, running an X server as
usual. In a room down the hall, I have a laptop that's booted up, but
hasn't been used yet. It's sitting at a VC prompt waiting for someone
to log in. There's no X server running on it.
I've connected to the laptop with ssh from an xterm here on my A-i-O,
and typed into the /laptop/:
$ xrandr --output eDP --rotate right
and immediately, my screen blanks, comes back a second later, and
everything is sideways. When I type:
$ xrandr --output eDP --rotate normal
then normality is restored.
So I ran xrandr on the laptop, but xrandr is not concerned with that
machine, but only with the X /server/, running on my A-i-O.
https://en.wikipedia.org/wiki/X_Window_System
Cheers,
David.
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