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.
On CentOS:
> 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?
03 Answers
I had a similar issue (didn't read all of your references though, short on time) and for me it worked with 3D acceleration enabled and grafics controller VBoxSVGA. Noting else changed.
I am on version 6.0.12 on the host and the additions are 6.0.14.
My solution was to set the display to VBoxVGA (VirtualBox 6.1.6 r137129 Qt5.9.5, Guest additions installed, Debian 10)
Running VirtualBox as a superuser (or Administrator in Windows) resulted with ungrayed “Auto resize guest display” button, thus solving the issue for me.
