[Spice-devel] Fedora 25 guest no changing resolution correctly

[Frediano Ziglio]

> Hello list,

> Recently, we updated the Qemu version being used by flexVDI. We were using a
> pre-3.3 QXL device, so it did not provide the client_monitors_config
> callback and that message was getting through to the VDAgent, which in turn
> changed the resolution of the guest. This was working flawlessly both on
> Windows and Linux guests.

> With the new version (we are using qemu v2.6.0 from RHEV 7.3 and spice-server
> v0.12.8 from RHEL 7.4, with a couple of small changes), the
> client_monitors_config callback gets called. This works correctly on Windows
> guests, but on Linux guests (tested mainly with Fedora 25, stock vdagent and
> QXL Xorg driver, which are quite up to date) the following happens when a
> resolution change is requested by the client:
> - The new resolution is detected by the Xorg server, it can be seen with
> xrandr.
> - If the old resolution was a custom one, the display changes to the new one.
> - If the old resolution was a standard one (like 640x480, 1024x768,
> 1920x1080, etc), the display DOES NOT change to the new one.
> I have read quickly through the list archive but found nothing about this
> problem. Is there something we are missing? Something else we should be
> upgrading too?

> Possible solutions we are considering:
> - Change to virtio-vga for Linux guests. However, we'd rather use the same
> graphics device for all guest types.

this is more a workaround of the problem 

> - Do not filter the monitors config message and let the vdagent change the
> resolution.

Sorry, not clear which component is filtering this message out. 
I have some remembrance that the path is a bit different from Windows to Linux. 

> - Fix whatever needs to be fixed in order to make this work. However, we are
> not sure where the problem is. Spice server? Xorg? Qemu?
> Do you have any comments on this?

>From your description and the fact that work on Windows guest looks like is a problem with the guest, either the agent or the kernel qxl driver. 

> Thanks in advance.

Frediano 
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