I have a virtual machine on VirtualBox (version 6.0.6), guest system CentOS 7, host system Windows 10. Extension pack is installed. Graphics controller is VBoxVGA.
I followed the steps here for installation of VirtualBox Guest Additions (no errors displayed) and reboot.
> systemctl -t service | grep vbox VBoxadd-service.service loaded active running VBoxadd-service.service
(that means guest additions are running). "Auto resize guest display" is still greyed out.
About current kernel:
> sudo uname -r 3.10.0-957.12.2.e17.x86_64
- This Q and A does not help in my case.
- This one does not explain how to get auto-resize working.
- This is not helpful as I already installed guest additions.
- This one not provide solution.
Note that on the same host, Fedora 30 virtual machine and Ubuntu 14.04 virtual machine "auto resize" properly works.
Update: still happens with VirtualBox 6.0.8 (updated Extension Pack and Guest Additions too).
Any hint? What I'm missing?