VNC Gnome toggles display scaling to 200%

[Per Weijnitz]

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

[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.

[Per Weijnitz]

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

[Per Weijnitz]

Oh, and a local X-server with Gnome is currently running too, on the remote host. Perhaps that complicates things even further, in case Gnome has problems separating things.

[Per Weijnitz]

The problem has been solved, and it was not related to TurboVNC.

In case anyone has the same problem, here's what I did:

  1. thorough reset of gnome settings:  dconf reset -f /org/gnome/

  2. remove all "Xft.dpi"-settings från your X-resource files (I had it both in ~/.Xdefaults and ~/.Xresources).

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[DRC]

Cool.  I will do some tinkering and update the wiki here with best practices:

https://turbovnc.org/Documentation/Compatibility30

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