I'm trying to properly install virtualbox guest additions to a guest linux Debian virtual machine. The problem is that video performance, at 1920x1080 is crap. The host is a macOS core i5 with a radeon R9 M395.
I've installed all virtualbox-guest packages:
virtualbox-guest-x11 virtualbox-guest-dkms virtualbox-guest-addittions
After looking inside /var/log/Xorg.0.log it seems that vboxvideo module is not loading.
$ cat /var/log/Xorg.0.log
...
[ 15.387] (II) LoadModule: "vboxvideo"
[ 15.388] (WW) Warning, couldn't open module vboxvideo
[ 15.388] (II) UnloadModule: "vboxvideo"
[ 15.388] (II) Unloading vboxvideo
[ 15.388] (EE) Failed to load module "vboxvideo" (module does not exist, 0)
...
$ dkms stat
virtualbox-guest, 5.1.12, 4.8.0-2-amd64, x86_64: installed
$ uname -r
4.8.0-2-amd64
$ lsmod| grep vbox
vboxsf 49152 0
vboxvideo 49152 2
vboxguest 282624 6 vboxsf,vboxvideo
ttm 98304 1 vboxvideo
drm_kms_helper 155648 1 vboxvideo
drm 360448 5 vboxvideo,ttm,drm_kms_helper
What's happening?
Where shall be locatedcould I locate vboxvideo module? What is the filename?
Where shall I look next?