And here is the output of the command in the host Xubuntu 24.04 host.
ps faux | grep qemu
176:andrew 32868 0.0 0.0 9148 2304 pts/3 S+ 18:36 0:00
| \_ grep -n --color qemu
248:swtpm 31916 0.0 0.0 9532 6656 ? S 18:22 0:00
/usr/bin/swtpm socket --ctrl
type=unixio,path=/run/libvirt/qemu/swtpm/3-XubuBeta-swtpm.sock,mode=0600
--tpmstate
dir=/var/lib/libvirt/swtpm/334869dd-4c43-4051-958c-5fc7ecbaa151/tpm2,mode=0600
--log file=/var/log/swtpm/libvirt/qemu/XubuBeta-swtpm.log --terminate --tpm2
249:libvirt+ 31929 4.9 31.7 6049096 2508516 ? Sl 18:22 0:41
/usr/bin/qemu-system-x86_64 -name guest=XubuBeta,debug-threads=on -S -object
{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-3-XubuBeta/master-key.aes"}
-blockdev
{"driver":"file","filename":"/usr/share/OVMF/OVMF_CODE_4M.ms.fd","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}
-blockdev
{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"raw","file":"libvirt-pflash0-storage"}
-blockdev
{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/XubuBeta_VARS.fd","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}
-blockdev
{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"raw","file":"libvirt-pflash1-storage"}
-machine
pc-q35-8.2,usb=off,vmport=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,hpet=off,acpi=on
-accel kvm -cpu host,migratable=on -global
driver=cfi.pflash01,property=secure,value=on -m size=4194304k -object
{"qom-type":"memory-backend-ram","id":"pc.ram","size":4294967296} -overcommit
mem-lock=off -smp 2,sockets=2,cores=1,threads=1 -uuid
334869dd-4c43-4051-958c-5fc7ecbaa151 -no-user-config -nodefaults -chardev
socket,id=charmonitor,fd=32,server=on,wait=off -mon
chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global
kvm-pit.lost_tick_policy=delay -no-shutdown -global ICH9-LPC.disable_s3=1
-global ICH9-LPC.disable_s4=1 -boot strict=on -device
{"driver":"pcie-root-port","port":16,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x2"}
-device
{"driver":"pcie-root-port","port":17,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x2.0x1"}
-device
{"driver":"pcie-root-port","port":18,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x2.0x2"}
-device
{"driver":"pcie-root-port","port":19,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x2.0x3"}
-device
{"driver":"pcie-root-port","port":20,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x2.0x4"}
-device
{"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"}
-device
{"driver":"pcie-root-port","port":22,"chassis":7,"id":"pci.7","bus":"pcie.0","addr":"0x2.0x6"}
-device
{"driver":"pcie-root-port","port":23,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x2.0x7"}
-device
{"driver":"pcie-root-port","port":24,"chassis":9,"id":"pci.9","bus":"pcie.0","multifunction":true,"addr":"0x3"}
-device
{"driver":"pcie-root-port","port":25,"chassis":10,"id":"pci.10","bus":"pcie.0","addr":"0x3.0x1"}
-device
{"driver":"pcie-root-port","port":26,"chassis":11,"id":"pci.11","bus":"pcie.0","addr":"0x3.0x2"}
-device
{"driver":"pcie-root-port","port":27,"chassis":12,"id":"pci.12","bus":"pcie.0","addr":"0x3.0x3"}
-device
{"driver":"pcie-root-port","port":28,"chassis":13,"id":"pci.13","bus":"pcie.0","addr":"0x3.0x4"}
-device
{"driver":"pcie-root-port","port":29,"chassis":14,"id":"pci.14","bus":"pcie.0","addr":"0x3.0x5"}
-device
{"driver":"qemu-xhci","p2":15,"p3":15,"id":"usb","bus":"pci.2","addr":"0x0"}
-device
{"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.3","addr":"0x0"}
-blockdev
{"driver":"file","filename":"/home/andrew/KVM/KVM-pool/XubuBeta.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}
-blockdev
{"node-name":"libvirt-2-format","read-only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null}
-device
{"driver":"virtio-blk-pci","bus":"pci.4","addr":"0x0","drive":"libvirt-2-format","id":"virtio-disk0","bootindex":1}
-device {"driver":"ide-cd","bus":"ide.0","id":"sata0-0-0","bootindex":2}
-netdev {"type":"tap","fd":"33","vhost":true,"vhostfd":"36","id":"hostnet0"}
-device
{"driver":"virtio-net-pci","netdev":"hostnet0","id":"net0","mac":"52:54:00:15:18:fc","bus":"pci.1","addr":"0x0"}
-chardev pty,id=charserial0 -device
{"driver":"isa-serial","chardev":"charserial0","id":"serial0","index":0}
-chardev socket,id=charchannel0,fd=31,server=on,wait=off -device
{"driver":"virtserialport","bus":"virtio-serial0.0","nr":1,"chardev":"charchannel0","id":"channel0","name":"org.qemu.guest_agent.0"}
-chardev spicevmc,id=charchannel1,name=vdagent -device
{"driver":"virtserialport","bus":"virtio-serial0.0","nr":2,"chardev":"charchannel1","id":"channel1","name":"com.redhat.spice.0"}
-chardev socket,id=chrtpm,path=/run/libvirt/qemu/swtpm/3-XubuBeta-swtpm.sock
-tpmdev emulator,id=tpm-tpm0,chardev=chrtpm -device
{"driver":"tpm-crb","tpmdev":"tpm-tpm0","id":"tpm0"} -device
{"driver":"usb-tablet","id":"input0","bus":"usb.0","port":"1"} -audiodev
{"id":"audio1","driver":"spice"} -spice
port=5900,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on
-device
{"driver":"virtio-vga","id":"video0","max_outputs":1,"bus":"pcie.0","addr":"0x1"}
-device {"driver":"ich9-intel-hda","id":"sound0","bus":"pcie.0","addr":"0x1b"}
-device
{"driver":"hda-duplex","id":"sound0-codec0","bus":"sound0.0","cad":0,"audiodev":"audio1"}
-global ICH9-LPC.noreboot=off -watchdog-action reset -chardev
spicevmc,id=charredir0,name=usbredir -device
{"driver":"usb-redir","chardev":"charredir0","id":"redir0","bus":"usb.0","port":"2"}
-chardev spicevmc,id=charredir1,name=usbredir -device
{"driver":"usb-redir","chardev":"charredir1","id":"redir1","bus":"usb.0","port":"3"}
-device
{"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.5","addr":"0x0"}
-object {"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"}
-device
{"driver":"virtio-rng-pci","rng":"objrng0","id":"rng0","bus":"pci.6","addr":"0x0"}
-sandbox
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg
timestamp=on
andrew@xubunoble:~$
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https://bugs.launchpad.net/bugs/2126798
Title:
Can not change screen resolution in Xubuntu-25.10-beta running in
KVM/QEMU
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