[Bug 266038] emulators/virtualbox-ose 6.1.36_1 fails to startx

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266038

            Bug ID: 266038
           Summary: emulators/virtualbox-ose 6.1.36_1 fails to startx
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox@FreeBSD.org
          Reporter: gnuserland@mailbox.org
          Assignee: vbox@FreeBSD.org
             Flags: maintainer-feedback?(vbox@FreeBSD.org)

Dear Maintainer,

this is has been affecting me for a while, and I noticed that is shared among
other users:

https://forums.freebsd.org/threads/vboxvideo-driver-needs-a-bump.86128/
https://forums.freebsd.org/threads/black-screen-when-x-starts-after-upgrade.86237/page-2

My host is Win10 PRO 64Bit, Unfortunately I couldn't find any meaningful logs
for troubleshooting it: the screen goes black and it looks like nothing is
recorded anywhere therefore I was only able to reproduce the bug:

1. Download
https://download.freebsd.org/releases/amd64/amd64/ISO-IMAGES/13.1/FreeBSD-13.1-RELEASE-amd64-bootonly.iso.xz
2. Extract
3. Create a new virtual machine (FreeBSD 64Bit): PAE/NX & Nested VT-x/AMD-V
enabled; Paravirtualization interface: default; nested paging enabled.
4. Installation from ISO: basic installation, with clear ZFS filesystem, 64GB
(dynamic) disk, 2GB Ram, 2GB Swap, 64MB Video Mem, 2 vCPU.
5. # pkg upgrade and then pkg install xorg virtualbox-ose-additions
6. Modify RC.CONF: vboxguest_enable="YES" \ vboxservice_enable="YES" \
vboxservice_flags="--disable-timesync"
7. reboot, login, startx = works!
8. Modifiy repo into latest as described here:
https://docs.freebsd.org/en/books/handbook/book/#quarterly-latest-branch
9. # pkg upgrade: it will update among the others xorg and
virtualbox-ose-addition.
10: reboot; loging; startx: black screen.

For any additional request please  do not hesitate to ask!

Thanks,

Freezr (ex Gnuserland)

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