Seeing the same; although possibly a combination of VirtualBox 6.1.6 + Guest Additions, as Linux Mint guest switched to 800x600 after vbox 6.1.6 install before GA was updated.
- Host
Linux Mint 19.3 Cinnamon 64bit
- Guests
Kubuntu 20.04 (daily live) 64bit
Linux Mint 19.3 Cinnamon 64bit
Until fixed, here's a workaround...
Settings -> Display -> Screen -> Graphics Controller: VBoxVGA -> Acceleration: (untick) Enable 3D Acceleration.
May also need to use the guests Display settings to select a higher resolution.
@VirtualBox devs
For next major release, since 2D acceleration option was removed, 'Enable 3D Acceleration' could possibly renamed just 'Graphics Acceleration'? Thank you for your time.
I also failed to get a full-screen display when running guest additions 6.1.6.
Host: CentOS 7, Guest: CentOS 8 VMSVGA
I tried the following combinations, thinking it might have been the host VirtualBox version that caused the problem:
pre-upgrade:
Host 6.1.4, Guest 6.1.2 (due to clipboard copy-paste bug): this works in fullscreen
(upgraded host and GA)
Host 6.1.6, Guest 6.1.6: no fullscreen
(downgraded host version)
Host 6.1.4, Guest 6.1.6: no fullscreen
(downgraded GA)
Host 6.1.4, Guest 6.1.2: fullscreen works OK again
(upgraded just host)
Host 6.1.6, Guest 6.1.2: fullscreen still works OK
Seems to be Guest Additions for me; sticking with Host 6.1.6 and Guest Additions 6.1.2 for now.
Dave B wrote:Seeing the same; although possibly a combination of VirtualBox 6.1.6 + Guest Additions, as Linux Mint guest switched to 800x600 after vbox 6.1.6 install before GA was updated.
- Host
Linux Mint 19.3 Cinnamon 64bit
- Guests
Kubuntu 20.04 (daily live) 64bit
Linux Mint 19.3 Cinnamon 64bit
Until fixed, here's a workaround...
Settings -> Display -> Screen -> Graphics Controller: VBoxVGA -> Acceleration: (untick) Enable 3D Acceleration.
May also need to use the guests Display settings to select a higher resolution.
@VirtualBox devs
For next major release, since 2D acceleration option was removed, 'Enable 3D Acceleration' could possibly renamed just 'Graphics Acceleration'? Thank you for your time.
I have same problem with Linux Mint.
Do you know if there is loss of perfomance in Linux using VBoxVGA (instead VMSVGA)?
Same with Kubuntu 19.10 and openSUSE 15.1.
Can no longer resize guest windows. selecting a new size causes guest window to go to that size for about one second, then window reverts to small size. Acts as if guest additions were not installed, yet they are.
Reverting host and guest to VirtualBox 6.1.4 resolves the issue.
Similar issue here.
After upgrading guest additions to 6.1.6 resize no longer works on the login screen on two Debian 9 and Debian 10 machines.
Some of the VirtualBox resolution options (eg. Auto resize Guest Display) are also disabled while on the login screen.
After login resizing and all options work ok, and again stop working after logout (not just on a clean boot).
VirtualBox 6.1.6 and additions 6.1.4 works ok everywhere.
My Dual Screen Seamless settings with 3D acceleration (and extension pack) works for me on Ubuntu 19.10 with guest addition 6.1.6 (also with older 6.1.97) (Host is a Windows 10 with Intel gpu)
Also I'd assigned 256MB to the guest graphic card, and I'm using XFCE.
6.1.2 + 6.1.2 guest : window resizing OK
6.1.6 + 6.1.6 guest : Virtualbox log does show the proper size when I go full-screen but no resizing occurs. Did several rebuilds and reboots of the guest 6.1.6 and tried various graphic adapters in VB config
Went back to 6.1.2 + 6.1.2 : working again
Upgraded to 6.1.6 + kept my 6.1.2 guest additions in Fedora 31 : OK
(I have 6.1.6 VB + 6.1.6 Extensino Pack + 6.1.2 Guest Additions)
After upgrading the host to 6.1.6 I upgraded also the guest additions but I found several problems related to screen resolution and graphic settings.
I downgraded the guest additions to 6.14 and now seems everything run smoothly again.