[Spice-devel] Multi-head Spice

[Jonathon Jongsma]

On Wed, 2017-03-01 at 11:36 +0200, Snir Sheriber wrote:
> 
> 
> On 02/28/2017 11:06 PM, Jonathon Jongsma wrote:
> > On Tue, 2017-02-28 at 16:19 +0100, Christophe de Dinechin wrote:
> > > > On 28 Feb 2017, at 15:37, Jonathon Jongsma <jjongsma at redhat.com
> > > > >
> > > > wrote:
> > > > 
> > > > On Tue, 2017-02-28 at 10:29 +0100, Christophe de Dinechin
> > > > wrote:
> > > > > > On 27 Feb 2017, at 23:18, Jonathon Jongsma <jjongsma at redhat
> > > > > > .com
> > > > > > 
> > > > > > wrote:
> > > > > > 
> > > > > > On Mon, 2017-02-27 at 17:53 +0100, Christophe de Dinechin
> > > > > > wrote:
> > > > > > > I tried to setup a multi-head guest, but I’m having
> > > > > > > trouble
> > > > > > > getting
> > > > > > > multiple displays to work correctly
> > > > > > > 
> > > > > > > For Jonathon, the part that I had trouble with was adding
> > > > > > > “heads
> > > > > > > =
> > > > > > > ‘4’" to the video / QXL configuration. I don’t see it
> > > > > > > documented
> > > > > > > in
> > > > > > > https://www.spice-space.org/spice-user-
> > > > > > > manual.html#_multiple_monitor_support.
> > > > > > 
> > > > > > Yep, it's a fairly new feature. I'm working on additional
> > > > > > multi-
> > > > > > monitor 
> > > > > > documentation and will be sure to include that.
> > > > > 
> > > > > Thanks
> > > > > 
> > > > > > > For Christophe F, what I get with the configuration file
> > > > > > > http://p
> > > > > > > aste
> > > > > > > bin.com/FEXbjaE3 is shown in the following picture https:
> > > > > > > //re
> > > > > > > dski
> > > > > > > ncat
> > > > > > > .wordpress.com/2017/02/27/learning-more-about-mesa/#jp-
> > > > > > > carousel-
> > > > > > > 1224.
> > > > > > > As far as I remember, this is pretty much a default
> > > > > > > configuration
> > > > > > > of
> > > > > > > Fedora 25 after install from the live CD. If I understand
> > > > > > > correctly,
> > > > > > > the difference with you is that I actually installed.
> > > > > > > 
> > > > > > > Does anybody else see this? If not, what could be wrong
> > > > > > > with
> > > > > > > my
> > > > > > > setup?
> > > > > > > 
> > > > > > 
> > > > > > I don't see anything obviously wrong with the
> > > > > > configuration. If
> > > > > > you
> > > > > > close the spice client and immediately re-connect does it
> > > > > > still
> > > > > > show
> > > > > > the same thing in both windows?
> > > > > 
> > > > > Yes. It reopens two windows, both with monitor 2.
> > > > > 
> > > > > 
> > > > > > Can you capture the debug output of running virt-viewer
> > > > > > with
> > > > > > the --
> > > > > > debug and --spice-debug options while you enable the second
> > > > > > monitor?
> > > > > > That might give a clue about what's happening.
> > > > > 
> > > > > Attached. I find it suspicious that we only have surface id
> > > > > 0.
> > > > 
> > > > I didn't see an attachment. Maybe it was stripped because it
> > > > was
> > > > too
> > > > big? Perhaps a pastebin somewhere would be easier?
> > > 
> > > It’s here: http://pastebin.com/EY0AjfHK
> > > 
> > > Thanks
> > > Christophe
> > 
> > So, I did manage to reproduce this now. I just created a new guest
> > vm
> > and installed a fresh fedora25 and I finally observed the issue. I
> > also
> > observed that sometimes the screen would flash back and forth
> > between
> > the contents of screen 1 and the contents of screen 2. You can see
> > a
> > video of that here:
> > 
> > https://youtu.be/aQhv9Q45ecM
>  
> Yes, that's similar to what i experienced, it currently works for me
> with large enough memory (didn't help before the update), but
> I just noticed that if i apply 2 displays before login it doesn't
> work
> at all.

Interesting. Changing the video memory doesn't seem to affect it at all
on my vm.


> I think gnome behavior has changed , applying 2 displays (logged in)
> causing to automatic log out, iirc it didn't happen before the
> update.
> 
> > The client is sending the appropriate config to the guest, but the
> > guest is incorrectly configuring the two displays at the same
> > position
> > (0,0). The displays aren't actually mirrored, they're technically
> > two
> > separate displays but they're both located at the same position on
> > the
> > underlying surface. Pavel and Snir both mentioned on IRC that
> > updating
> > packages on fedora25 fixed the problem, but I found that even after
> > updating everything on my new guest, I was still able to reproduce
> > the
> > issue. I guess it needs more investigation to figure out which
> > component is at fault here.
> > 
> > Jonathon
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>