Hi, On Mon, Mar 22, 2021 at 01:46:08PM +0000, Dr. Jennifer Nussbaum wrote: > I hope it's OK to ask a basic question on the -devel list, but > this is what was listed in the Support section.... Sure > I'm using virt-manger, and its related suite of stuff, to run > KVM/QEMU VM's on a Debian Bullseye host, which has two 4K > monitors. I am unable to get dual-head working at all, and I > can't get 4K resolution working in the way I'm apparently > supposed to. Can you share the vm's domain? virsh dumpxml $vm > I have a Debian Bullseye guest, with spice-vdagent and the QXL > video drivers installed in it. The Spice user manual suggests > that multiple-monitor support is easy; you're supposed to use a > Video QXL device and then everything should just work. But it > doesn't. Even when I increase the video memory in the XML file > (vgamem, I assume) to 64MB I am unable to get 4K on even a > single monitor using Settings -> Display on the guest; it maxes > out at some arbitrary-seeming thing a bit over 1980 x 1200. And > regardless of resolution, I also do not have a second monitor > available in the guest. Are you accessing with virt-manager? I don't think there is support for multi-monitor there? You should use virt-viewer or remote-viewer instead. > If I have a video device set to Virtio, then 4K works perfectly > on the guest machine; if I go to Settings -> Display there, I > can select 4096 x 2160, and I get lovely 4K video. However, > dual-head does not work. If I try to edit the XML for the video > device to 'heads="2"', there is no effect--at least, when I > restart the guest and go to Settings -> Display, there isn't an > option for selecting another monitor. Could someone tell me > what I'm supposed to be doing? Thank you. Just confirming, for Spice multi-monitor [0] in recent linux guests, one qxl device is enough and you should set the heads to 2 (virsh edit $vm) [0] https://www.spice-space.org/multiple-monitors.html Cheers, Victor
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