VirtualBox is Oracle’s excellent open-source virtual machine product. I was quite comfortable with it until version 6.0.

I knew a Reddit user has warned version 6.0 issues, but I upgraded.

VirtualBox 6.0

I’m using Xubuntu 18.10 guest on Windows 10 host. After upgrade, graphics performance became horrible. It was able to resize the screen. Xorg server process was always consuming CPU time. Larger screen size, more CPU load.

Xorg.0.log shows failing to load vboxvideo Xorg driver.

[ 53.621] (EE) Failed to load module “vboxvideo” (module does not exist, 0)

It seems that fb sub module of fbdev module was loaded. I guess this is the cause of CPU load.

Here is the full log.

According to this comment, vboxvideo Xorg driver is not needed.

That’s true but we don’t intend to ship a driver for X.org 1.19 because systems with such a new X server should be able to load the vboxvideo kernel module.

According to Oracle® VM VirtualBoxRelease Notes for Release 6.0: 1.8. User Interface Changes, version 6.0 has three types of virtual video controllers, VBoxSVGA, VBoxVGA and VMSVGA. VBoxSVGA is the default. I tried VMSVGA, too. vmware Xorg driver was loaded in that case. It performed better than fbdev, but not good enough.

VirtualBox 5.2

Then, I downgraded to version 5.2, and everything is working fine.

  • lsmod shows vboxvideo and vmwgfx kernel modules are loaded.
  • lspci shows VMware SVGA II Adapter.
  • Xorg.0.log shows vmware Xorg driver is used.

Here is the full log.