On Monday, March 22, 2021, 10:51:48 AM EDT, Victor Toso <victortoso@xxxxxxxxxx> 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.
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)
> > 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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