[Spice-devel] Multi-head Spice

[Snir Sheriber]

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 picturehttps://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.
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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