[Spice-devel] Multiple monitors at 4K, in virt-manager?
Uri Lublin
uril at redhat.com
Mon Mar 22 17:35:27 UTC 2021
On 3/22/21 5:27 PM, Dr. Jennifer Nussbaum wrote:
> On Monday, March 22, 2021, 10:51:48 AM EDT, Victor Toso
> <victortoso at 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.
Hi,
It seems 64MB is not enough.
4096 * 2160 * 4 * 2 > 64MB
Can you try replacing all those 64MB below with 128MB ?
Please try with 1 head first. Possibly 2 heads need
more (but not for all params).
Regards,
Uri.
> >
> > 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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