The OP informed me that this issue was apparently due to missing Xfce 
packages.  It was not related to TurboVNC.

On Monday, December 7, 2020 at 7:17:00 PM UTC-6 DRC wrote:

> I sincerely apologize for the delay in responding to this.  This year has 
> been really nuts, and it's only been within the past week that I have 
> finally been able to pop the stack on TurboVNC issues.
>
> Wacom tablet support is implemented in different ways on different client 
> platforms.  For Linux/Un*x clients, we use the GII RFB extension to forward 
> all relevant X Input devices in kind from the client to the server (that's 
> what the GII extension was designed to do.)  For Mac clients, however, 
> there is no analogue to X Input.  Tablet support is integrated into the 
> O/S, and the TurboVNC Viewer doesn't know whether a particular tablet 
> device is available until it receives a "proximity" event that tells it 
> that the tablet device has entered the proximity of the viewer window.  
> Thus, the Mac TurboVNC Viewer mocks up two GII devices for the Wacom stylus 
> and eraser and always creates those devices on the server via GII, 
> regardless of whether a tablet is actually present or in use on the 
> client.  The presence of those devices in the TurboVNC session is normal, 
> but obviously the behavior you're observing isn't.
> Please try running the viewer from the Terminal using 
>
>   /opt/TurboVNC/bin/vncviewer -loglevel 150
>
> That will print any GII (ExtInputDevice) messages to the console.  You 
> should see some initial output from creating both the stylus and eraser 
> devices, but you should not see any additional ExtInputDevice messages as 
> you move or click the mouse.  If you do see those messages, then that 
> probably means that your mouse is being incorrectly detected as a tablet, 
> which is a bug.
>
> I also just pushed a commit that allows GII to manually be disabled by 
> setting JAVA_TOOL_OPTIONS="-Dturbovnc.gii=0" in the environment.  The 
> latest pre-release builds (https://turbovnc.org/DeveloperInfo/PreReleases) 
> should have that fix.  Disabling GII will at least tell you whether that's 
> the cause of the issue.  If it's not, then I have no other ideas.
> On 10/19/20 1:07 PM, qwofford wrote:
>
> I noticed that in XFCE sessions, the mouse cursor is not present in my 
> TurboVNC client view. The TurboVNC server produces the following log output:
>
> 06/10/2020 10:19:24 Client supports GII version 1
> 06/10/2020 10:19:24 GII Device Create: Stylus
> 06/10/2020 10:19:24 GII device ID = 1
> 06/10/2020 10:19:24 GII Device Create: Eraser
> 06/10/2020 10:19:24 GII device ID = 2
>
> Which leads me to believe the mouse is not being identified correctly. I 
> am connecting from a TurboVNC 2.2.5 client on OSX, with a Logitech G500 
> mouse (details of the mouse are attached). I noticed my xorg.conf has 
> references to a mouse, so I posted this in the VirtualGL group originally, 
> but I was informed that this config section is not relevant to IO in a 
> combined TurboVNC/VirtualGL solution. The server is running on Centos8, 
> with TVNC v2.2.5. The session desktop is configured to use XFCE4.
>
> Note: I am also getting an "XFCE PolicyKit Agent" error when the TVNC 
> desktop connects. I suspect this is a different problem, but mention here 
> for the sake of completeness.
>
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