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Created attachment 1585050[details]
a video evidence
Description of problem:
Remnant of mouse cursor left under the bottom right after VM first boot
Version-Release number of selected component (if applicable):
4.18.0-107.el8.x86_64(host & guest)
qemu-kvm-4.0.0-4.module+el8.1.0+3356+cda7f1ee.x86_64
How reproducible:
100%
Steps to Reproduce:
1.Boot rhel 8.1 vm with qemu cli:
/usr/libexec/qemu-kvm \
-name guest=vnc,debug-threads=on \
-S \
-object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-2-vnc/master-key.aes \
-machine pc-q35-rhel8.0.0,accel=kvm,usb=off,dump-guest-core=off \
-cpu Opteron_G5,vme=on,x2apic=on,tsc-deadline=on,hypervisor=on,arat=on,tsc_adjust=on,bmi1=on,arch-capabilities=on,mmxext=on,fxsr_opt=on,cmp_legacy=on,cr8legacy=on,osvw=on,perfctr_core=on,ibpb=on,virt-ssbd=on,svm=off \
-m 8192 \
-overcommit mem-lock=off \
-smp 2,sockets=1,cores=2,threads=1 \
-uuid 1465b8c2-fc8b-4449-84ee-a2d63314bc6e \
-no-user-config \
-nodefaults \
-chardev socket,id=charmonitor,fd=29,server,nowait \
-mon chardev=charmonitor,id=monitor,mode=control \
-rtc base=utc,driftfix=slew \
-global kvm-pit.lost_tick_policy=delay \
-no-hpet \-no-shutdown \-global ICH9-LPC.disable_s3=1 \-global ICH9-LPC.disable_s4=1 \-boot strict=on \-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 \ -device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 \-device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 \-device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 \-device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 \-device pcie-root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 \-device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 \-device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 \-device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 \
-drive file=/home/virtimages/VirtualMachines/vnc.img,format=raw,if=none,id=drive-virtio-disk0 \-device virtio-blk-pci,scsi=off,bus=pci.4,addr=0x0,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \
-netdev tap,fd=30,id=hostnet0,vhost=on,vhostfd=31 \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:56:00:00:00:09,bus=pci.1,addr=0x0 \
-chardev file,id=charserial0,path=/mnt/tests/distribution/virt/install/guests/vnc/logs/vnc_console.log \
-device isa-serial,chardev=charserial0,id=serial0 \
-chardev pty,id=charserial1 \
-device isa-serial,chardev=charserial1,id=serial1 \
-chardev socket,id=charchannel0,fd=32,server,nowait \
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 \
-device usb-tablet,id=input0,bus=usb.0,port=1 \
-vnc 0.0.0.0:0 \
-device VGA,id=video0,vgamem_mb=16,bus=pcie.0,addr=0x1 \
-device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 \
-object rng-random,id=objrng0,filename=/dev/urandom \
-device 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
2.connect to VM desktop in full screen mode(use remote-viewer with -f option, this way can make issue been observed more easily)
3.move mouse cursor at gdm login screen
Actual results:
After step 3, can see a remnant of mouse cursor will be left under the bottom right
Expected results:
No remnant of mouse cursor is left
Additional info:
After moving mouse cursor for some seconds, the remnant will disappear.
qemu stdvga has no hardware cursor support, so rendering the cursor is completely in the hands of the guest, so clearly not a qemu bug.
Most likely the guests software cursor support is buggy. Not sure which component is at fault though. Assigning to gdm for investigation.
This bug is still able to be reproduced on rhel 8.3 with 4.18.0-226.el8.x86_64 and gdm-3.28.3-20.el8.x86_64
Gnome session is wayland
Comment 3Ray Strode [halfline]
2020-07-22 20:22:06 UTC
likely a mutter bug, reassigning.
Comment 6RHEL Program Management
2021-02-01 07:41:49 UTC
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.
Well, I can still reproduce this issue qemu-kvm-5.2.0-4.module+el8.4.0+9676+589043b9.x86_64..
But I also agree with the priority/Severity of this bug as this looks like a minor mouse rendering issue and seems customer havn't complained this. So I think it's safe to close this bug as won't fix
Zhiyi
Created attachment 1585050 [details] a video evidence Description of problem: Remnant of mouse cursor left under the bottom right after VM first boot Version-Release number of selected component (if applicable): 4.18.0-107.el8.x86_64(host & guest) qemu-kvm-4.0.0-4.module+el8.1.0+3356+cda7f1ee.x86_64 How reproducible: 100% Steps to Reproduce: 1.Boot rhel 8.1 vm with qemu cli: /usr/libexec/qemu-kvm \ -name guest=vnc,debug-threads=on \ -S \ -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-2-vnc/master-key.aes \ -machine pc-q35-rhel8.0.0,accel=kvm,usb=off,dump-guest-core=off \ -cpu Opteron_G5,vme=on,x2apic=on,tsc-deadline=on,hypervisor=on,arat=on,tsc_adjust=on,bmi1=on,arch-capabilities=on,mmxext=on,fxsr_opt=on,cmp_legacy=on,cr8legacy=on,osvw=on,perfctr_core=on,ibpb=on,virt-ssbd=on,svm=off \ -m 8192 \ -overcommit mem-lock=off \ -smp 2,sockets=1,cores=2,threads=1 \ -uuid 1465b8c2-fc8b-4449-84ee-a2d63314bc6e \ -no-user-config \ -nodefaults \ -chardev socket,id=charmonitor,fd=29,server,nowait \ -mon chardev=charmonitor,id=monitor,mode=control \ -rtc base=utc,driftfix=slew \ -global kvm-pit.lost_tick_policy=delay \ -no-hpet \-no-shutdown \-global ICH9-LPC.disable_s3=1 \-global ICH9-LPC.disable_s4=1 \-boot strict=on \-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 \ -device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 \-device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 \-device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 \-device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 \-device pcie-root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 \-device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 \-device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 \-device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 \ -drive file=/home/virtimages/VirtualMachines/vnc.img,format=raw,if=none,id=drive-virtio-disk0 \-device virtio-blk-pci,scsi=off,bus=pci.4,addr=0x0,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \ -netdev tap,fd=30,id=hostnet0,vhost=on,vhostfd=31 \ -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:56:00:00:00:09,bus=pci.1,addr=0x0 \ -chardev file,id=charserial0,path=/mnt/tests/distribution/virt/install/guests/vnc/logs/vnc_console.log \ -device isa-serial,chardev=charserial0,id=serial0 \ -chardev pty,id=charserial1 \ -device isa-serial,chardev=charserial1,id=serial1 \ -chardev socket,id=charchannel0,fd=32,server,nowait \ -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 \ -device usb-tablet,id=input0,bus=usb.0,port=1 \ -vnc 0.0.0.0:0 \ -device VGA,id=video0,vgamem_mb=16,bus=pcie.0,addr=0x1 \ -device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 \ -object rng-random,id=objrng0,filename=/dev/urandom \ -device 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 2.connect to VM desktop in full screen mode(use remote-viewer with -f option, this way can make issue been observed more easily) 3.move mouse cursor at gdm login screen Actual results: After step 3, can see a remnant of mouse cursor will be left under the bottom right Expected results: No remnant of mouse cursor is left Additional info: After moving mouse cursor for some seconds, the remnant will disappear.