VB 4.3.6 additions for Solaris problems under illumos based XStream Desktop

[Gabriele Bulfon]

Hi,
I've been informed recently that the latest 4.3.6 additions contain updated drivers for Solaris 11
that consider also new Xorg 1.13.1 and 1.14.5
Our new beta XStream Desktop distro is based on illumos, features Xorg 1.13.1, and finally
the new additions correctly installs vboxvideo for 1.13.1.
We also have a dev version based on Xorg 1.14.5, and also this installs correctly vboxvideo for 1.14.5.
BUT
problem is both versions don't work correctly.
Once the desktop starts, running cairo-dock in OGL mode, a black box is drawn around the dock area,
while it's usually transparent.
Also, I found errors in the Xorg.0.log about DRI &vboxvideo.
Finally, no XVideo support (xvinfo reveals nothing).
Here is what I find in the Xorg.0.log, if anyone can give suggestions!
[ 5848.233] (II) LoadModule: "vboxvideo"
[ 5848.233] (II) Loading /usr/lib/xorg/modules/drivers/vboxvideo_drv.so
[ 5848.271] (II) Module vboxvideo: vendor="Oracle Corporation"
[ 5848.271] compiled for 10.14.0, module version = 1.0.1
[ 5848.271] Module class: X.Org Video Driver
[ 5848.271] ABI class: X.Org Video Driver, version 14.1
[ 5848.272] (**) Load address of symbol "VBOXVIDEO" is fffffd7ffe67f5c0
[ 5848.272] (II) VBoxVideo: guest driver for VirtualBox: vbox
[ 5848.272] (++) using VT number 7
....
....
[ 5848.377] (==) VBoxVideo(0): Using gamma correction (1.0, 1.0, 1.0)
[ 5848.377] (==) VBoxVideo(0): DPI set to (96, 96)
[ 5848.377] (--) Depth 24 pixmap format is 32 bpp
[ 5848.386] drmOpenDevice: node name is /dev/dri/card0
[ 5848.387] drmOpenDevice: open result is -1, (No such device or address)
[ 5848.387] drmOpenDevice: open result is -1, (No such device or address)
[ 5848.387] drmOpenDevice: Open failed
[ 5848.387] drmOpenDevice: node name is /dev/dri/card0
[ 5848.387] drmOpenDevice: open result is -1, (No such device or address)
[ 5848.387] drmOpenDevice: open result is -1, (No such device or address)
[ 5848.387] drmOpenDevice: Open failed
[ 5848.387] [drm] failed to load kernel module "vboxvideo"
[ 5848.387] (EE) [drm] drmOpen failed.
[ 5848.387] (EE) VBoxVideo(0): DRIScreenInit failed, disabling DRI.
[ 5848.387] (II) VBoxVideo(0): visual configurations initialized