dual display VM debian12 + KDE Plasma

[h00bi]

Hi,

i'm having trouble with the config of a VM.
My setup is proxmox on a Lenovo Thinkpad E540 (internal display only, lid permanetly closed, internal display off)

I installed a VM with debian 12 with KDE Plasma GUI.
I want to connect to this VM from my Windows 10 dual display setup and have a dual display full screen KDE.

I tried both "SPICE" and "Spice dual monitors" for display, but i can't get the second screen. i'm using VirtViewer v11.0-256 to connect.
Current config is "SPCIE (qxl,memory=128)"

I also reinstalled the VM several times with different spice display settings.

In VirtViewer, i see Display 1-4, but 2-4 are greyed out.

How can i get a dual display VM working with proxmox?

Kernel Version Linux 6.2.16-19-pve #1 SMP PREEMPT_DYNAMIC PMX 6.2.16-19 (2023-10-24T12:07Z)

PVE Manager Version pve-manager/8.0.9/fd1a0ae1b385cdcd

 

[fschauer]

Did you install spice-vdagent inside the VM?

sudo apt install spice-vdagent

Setting the display to "SPICE dual monitor" should then allow you to use a second display over SPICE.

 

[BobhWasatch]

You can also "apt install xrdp" inside the VM. Then you can use Windows Remote Desktop from your client machine. That has a setting for "use all monitors". Unfortunately if you want sound you'll have to visit this site and do some compiling of code: https://github.com/neutrinolabs/pulseaudio-module-xrdp

KDE Plasma isn't super-performant without a GPU but you probably already knew that.

 

[h00bi]

no,i did not.
https://pve.proxmox.com/wiki/SPICE#Troubleshooting

Linux​

All Linux distributions released after 2011 have the necessary qxl driver included as a part of the Xorg package.


So i guess this is something different, but it was totally misleading.

i installed spice-vdagent, but even after reboots and shutdowns,i can use just 1 display.

 

[h00bi]

You can also "apt install xrdp" inside the VM.

actually, i want to use this VM "as native as possible" because i want to jump different RDP Host from there.
Not sure if RDP in RDP is fine.... in some cases it could be RDP in RDP in RDP... feeling a litte bit like inception

KDE Plasma isn't super-performant without a GPU but you probably already knew that.

yes, but no big problem

 

[h00bi]

Tried this on a different host with an existiting windows 10 and windows 11 VM.
Both working fine in dual display mode after installing spice guest tools.

then i installed debian + KDE Plasma on this other host. Still the same problem, even after installing spice-vdagent
Tried both wayland and X11 version of KDE Plasma.

Update: switched to xfce, works instant.
Update2: switched back to KDE Plasma, 2nd display is active now, but it is working very poor. Will try different DE and see whats best.

 

[h00bi]

After further testing, it seems like some Desktop Environments, especially KDE Plasma, simply don't work well with spice dual display.
No Proxmox issues here.
But thanks a lot for pushing me in the right direction.