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

[Christophe Fergeau]

Hey,

On Mon, Oct 23, 2017 at 09:51:51AM +0200, Javier Celaya wrote:
> 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?

With client-monitors-config, the qxl-kms driver is going to notify of
resolution changes through a hotplug-mode-update drm property. It then
needs cooperation from the window manager to react to this property
change.
See https://bugzilla.gnome.org/show_bug.cgi?id=711216
and https://git.gnome.org/browse/mutter/commit/?id=9575132
How are you triggering the resolution change to a standard resolution?
Which window manager/desktop environment are you running in the VM?

Christophe
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