On Wed, Jun 10, 2020 at 01:58:13PM +0200, Christian Ehrhardt wrote:
Hi, with a guest set up as in the following example mouse behavior breaks:
<graphics type='spice' port='5901' autoport='no' listen='0.0.0.0'> <listen type='address' address='0.0.0.0'/> <gl enable='no'/> </graphics> <video> <model type='qxl' ram='65536' vram='16384' vgamem='16384' heads='1' primary='yes'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/> </video> <video> <model type='qxl' ram='65536' vram='16384' vgamem='16384' heads='1'/> <address type='pci' domain='0x0000' bus='0x08' slot='0x01' function='0x0'/> </video>
Please note that this is for illustration purposes as this everyone can easily retry. I originally had QXL + GPU as mediated device, where the behavior is the same.
If I know connect to that via spice, spice is smart and opens both displays: $ virt-viewer --connect qemu+ssh://ubuntu@10.246.115.255/system guestname
But while with one display mouse integration (to move in/out smoothly) and positioning of the mouse pointer is fine. It is broken with this double display setup. What I see is: - no mouse integration anymore (falls back to capture the mouse) - often the mouse can not move upwards anymore - sometimes "left" also doesn't work
Let me know if someone wants a video in case the description is still too odd.
I have tried spice-client-gtk and virt-viewer, but both behave the same way.
If I take away one of the displays it works well again. So I'm wondering how virtual-multi-monitor is supposed to work, are there known bugs or tweaks that would apply here?
Did you enable the SPICE agent ? IIUC, the SPICE agent provides a paravirtualized mouse device, and that may be what's required to have this work properly with multi-monitor. The agent is also what lets you dynamically turn on/off each head and do display resizing. BTW, there are two ways todo multi-monitor with SPICE. One as youve shown here, and the oither using a single QXL card, but with heads=NNN instead of heads=1. One approach works best with Windows, and one approach works best with Linux, but I can't remember which way around. I expect they'll probably still have the same mouse behaviour though.
P.S. I tried VNC but that just has "other" issues. It only shows 1 of 2 displays and on the one I see over amplifies the mouse movement by the amount the other display adds to ther overall desktop size.
VNC simply doesn't support multi-monitor at all. In theory we could block this in libvirt, but then if QEMU fixed it, libvirt would be needlessly blocking it. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|