[Qemu-discuss] Enabling multiple guest monitors

[Michael Thayer]

(Hope this is the right list for the question.  I am not subscribed, so 
I would appreciate a CC on answers!)

Hello,

I was wondering if anyone could give me a hand getting Qemu working with 
multiple monitors, preferably virtio-gpu, otherwise qxl.  I am trying to 
get Fedora 25 to work better under VirtualBox, and want to compare with 
how it works under Qemu.  Currently known problems on our side are that 
Mutter is not sending dirty rectangle information when using software 
rendering and that absolute input from the tablet emulation is not 
translated to the right co-ordinates inside the guest (I think Mutter 
expects one tablet per monitor, which we currently do not do, and that 
any other Wayland compositor might potentially do this differently).  I 
am particularly interested in the second issue.

I am currently using Qemu from git, with all default configuration 
parameters except SDL ABI 2.0.  I am starting it with max_outputs=2. 
sysfs in the guest says that the second output is present but not 
connected.  So far I have not found a way to enable it; I am sure that I 
will eventually do so between reading the Qemu source and looking at 
code paths in gdb, but if someone has a hint for me it would be very 
helpful.

Regards and thanks,

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