#19635 new defect

Option "Auto-resize Guest Display" grayed out on Xubuntu/Kubuntu 20.4 Host and Windows 10 Guest

Reported by:	openminded	Owned by:
Component:	guest control	Version:	VirtualBox 6.1.8
Keywords:		Cc:
Guest type:	Windows	Host type:	Linux

Description

Option "Auto-resize Guest Display" is disabled / grayed out. Max. resolution is set to 1920x1200. Guest Add-Ons are installed (most recent ones).

I think problems started when I updated to Kubuntu/Xubuntu 20.04 (not really sure). I was able to reproduce this issue on three (!) machines independently. One with Xubuntu 20.04 and two with Kubuntu 20.04. Different graphics cards as well.

A solution is to set "Graphics Controller" from "VBoxSVGA" to "VBoxVGA" and disable 3D acceleration. Then you have to shut down and restart your VM properly (by OS shutdown functionality).

However, VBoxVGA is not recommended and 3D Acceleration is not available. Should be considered as a bug!

Laptop 1:

Lenovo Thinkpad P1 2nd Gen

Kubuntu 20.04

VirtualBox 6.1.8

NVIDIA Quadro T2000

Switchable graphics are disabled => Intel graphics card not used

nvidia-driver-440

Laptop 2:

Lenovo Thinkpad T430

Xubuntu 20.04

VirtualBox 6.1.8