Hello,
I have been experimenting a bit with plugging and unplugging of graphics
devices (using a dummy KMS driver which is udl stripped of the actual
hardware poking) and how the X server copes with that. It seems to cope
well with a secondary device being removed, but not with the only
graphics device in the system disappearing (in that case the
hot-pluggable device is not deemed to be a GPU device, and therefore not
removable if I understood what is happening correctly).
This is interesting for me because I am looking at putting a KMS driver
for the VirtualBox video device into the upstream kernel, but would like
to be able to update the driver at run-time, so that we are not stuck
with whatever version some guest distribution which is no longer being
updated happens to provide. My first idea for handling this was to
simulate a device unplug so that the old driver could be removed and the
new one added. (Not sure if I am handling the hotplug right in the
vboxvideo driver yet of course, but I assume that my dummy driver, which
just copies code from udl, does get it right.)
I will take a look at this when I get a chance of course, but I thought
I would write to the list before that in case anyone else has thoughts,
ideas or fixes (potenially including how I could better handle the
driver update).
Regards,
Michael
--
Michael Thayer | VirtualBox engineer
ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt
ORACLE Deutschland B.V. & Co. KG
Hauptverwaltung: Riesstraße 25, D-80992 München
Registergericht: Amtsgericht München, HRA 95603
Komplementärin: ORACLE Deutschland Verwaltung B.V.
Hertogswetering 163/167, 3543 AS Utrecht, Niederlande
Handelsregister der Handelskammer Midden-Nederland, Nr. 30143697
Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher
_______________________________________________
xorg-devel@lists.x.org: X.Org development
Archives: http://lists.x.org/archives/xorg-devel
Info: https://lists.x.org/mailman/listinfo/xorg-devel
