Yes, I have indeed had that parameter on 200% on the local X server 
previously. That can be the source of the problem.

torsdag 30 juni 2022 kl. 15:32:22 UTC+2 skrev DRC:

> Did you previously set the display scaling to 200% on the local 
> display?  GNOME has a tendency to store and restore display settings in 
> a way that interferes with VNC servers.  I will try to reproduce the issue.
>
> On 6/30/22 8:25 AM, Per Weijnitz wrote:
> >
> > I experience a possible bug regarding the Gnome display scaling (or 
> > I'm just doing something in the wrong way).
> >
> > To reproduce:
> >  1. start server on remote host: /opt/TurboVNC/bin/vncserver -fg
> >  2. setup ssh tunnel from local to remote: ssh -t -L 
> > 5900:localhost:5902 remoteserver 'read dummy'
> >  3. connect a client from local machine: /opt/TurboVNC/bin/vncviewer 
> >  localhost:0
> >      This results in a working session, with a Gnome session running. 
> > In my case, it has the display scaling set to 200% (can be checked 
> > with: gnome-control-center display)
> >  4. I can toggle scaling to 100% and things look good.
> >
> > Now, if I terminate the vncviewer session and reconnect, the scaling 
> > is back to 200%.
> > Also, if I switch to fullscreen, the scaling is back at 200%. And if I 
> > set it back to 100% in fullscreen, then toggle fullscreen off, the 
> > scaling jumps back to 200%.
> >
> > Client OS:     Debian GNU/Linux 11 (bullseye)
> > Remote OS: Ubuntu 22.04 LTS
> > TurboVNC: dev branch (3.1 evolving), turbovnc_3.0.80_amd64.deb, 
> > 43816122, Jun 23,f8f2c533e5a4dda891f4917856576b6e
>

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