On Monday, March 22, 2021, 10:51:48 AM EDT, Victor Toso <victort...@redhat.com> wrote: Hi,
On Mon, Mar 22, 2021 at 01:46:08PM +0000, Dr. Jennifer Nussbaum wrote: > > 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've posted this at the bottom of this message, with only small changes to obscure the UUID and paths. > > 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. virt-manager uses virt-viewer natively; it's what virt-manager fires up when you use the "view graphical console" option. Regardless, I did just launch virt-viewer separately, and it's functioning in the same way. > > 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) As you can see from the XML below, I do (think I) have one qxl device, with 2 heads and 64MB memory. When I go into the guest, the maximum resolution I am offered is 2952 x 1781. And there is only one display,called "Virtual-0". Thank you for looking this over. Jen ---- <domain type="kvm"> <name>debian-bullseye-test</name> <uuid>36d7d0e7-4801-4396-9f61-2b5022xxxxxxx</uuid> <memory unit="KiB">4194304</memory> <currentMemory unit="KiB">4194304</currentMemory> <vcpu placement="static">2</vcpu> <os> <type arch="x86_64" machine="pc-i440fx-2.8">hvm</type> <boot dev="hd"/> </os> <features> <acpi/> <apic/> <vmport state="off"/> </features> <cpu mode="host-model" check="partial"/> <clock offset="utc"> <timer name="rtc" tickpolicy="catchup"/> <timer name="pit" tickpolicy="delay"/> <timer name="hpet" present="no"/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <pm> <suspend-to-mem enabled="no"/> <suspend-to-disk enabled="no"/> </pm> <devices> <emulator>/usr/bin/kvm</emulator> <disk type="file" device="disk"> <driver name="qemu" type="qcow2"/> <source file="/home/user/VMs/debian-bullseye-clone.qcow2"/> <target dev="vda" bus="virtio"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x07" function="0x0"/> </disk> <disk type="file" device="cdrom"> <driver name="qemu" type="raw"/> <target dev="hda" bus="ide"/> <readonly/> <address type="drive" controller="0" bus="0" target="0" unit="0"/> </disk> <controller type="usb" index="0" model="ich9-ehci1"> <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x7"/> </controller> <controller type="usb" index="0" model="ich9-uhci1"> <master startport="0"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x0" multifunction="on"/> </controller> <controller type="usb" index="0" model="ich9-uhci2"> <master startport="2"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x1"/> </controller> <controller type="usb" index="0" model="ich9-uhci3"> <master startport="4"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x2"/> </controller> <controller type="pci" index="0" model="pci-root"/> <controller type="ide" index="0"> <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x1"/> </controller> <controller type="virtio-serial" index="0"> <address type="pci" domain="0x0000" bus="0x00" slot="0x06" function="0x0"/> </controller> <interface type="network"> <mac address="52:54:00:30:01:2b"/> <source network="default"/> <model type="rtl8139"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0"/> </interface> <serial type="pty"> <target type="isa-serial" port="0"> <model name="isa-serial"/> </target> </serial> <console type="pty"> <target type="serial" port="0"/> </console> <channel type="unix"> <target type="virtio" name="org.qemu.guest_agent.0"/> <address type="virtio-serial" controller="0" bus="0" port="1"/> </channel> <channel type="spicevmc"> <target type="virtio" name="com.redhat.spice.0"/> <address type="virtio-serial" controller="0" bus="0" port="2"/> </channel> <input type="tablet" bus="usb"> <address type="usb" bus="0" port="1"/> </input> <input type="mouse" bus="ps2"/> <input type="keyboard" bus="ps2"/> <graphics type="spice" autoport="yes"> <listen type="address"/> <image compression="off"/> </graphics> <sound model="ich6"> <address type="pci" domain="0x0000" bus="0x00" slot="0x04" function="0x0"/> </sound> <video> <model type="qxl" ram="65536" vram="65536" vgamem="65536" heads="2" primary="yes"/> <address type="pci" domain="0x0000" bus="0x00" slot="0x09" function="0x0"/> </video> <redirdev bus="usb" type="spicevmc"> <address type="usb" bus="0" port="2"/> </redirdev> <redirdev bus="usb" type="spicevmc"> <address type="usb" bus="0" port="3"/> </redirdev> <memballoon model="virtio"> <address type="pci" domain="0x0000" bus="0x00" slot="0x08" function="0x0"/> </memballoon> </devices></domain>
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