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[Bug 1750899] Re: Mouse cursor sometimes can't pass the invisible border

From: Launchpad Bug Tracker
Subject: [Bug 1750899] Re: Mouse cursor sometimes can't pass the invisible border on the right side of the screen
Date: Thu, 21 Jan 2021 04:17:18 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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  Mouse cursor sometimes can't pass the invisible border on the right
  side of the screen

Status in QEMU:

Bug description:
  I'm using qemu 2.11 on Gentoo Linux, with configured GPU passthrough (Radeon 
RX580) to the guest Windows 10.
  This configuration is alive for last 4 years, this time I changed a lot qemu, 
linux kernel and windows versions, changed GPU and always all was working as 
expected. I always used standard PS/2 mouse emulation and that was enough for 

  Now, I bought two new monitors, instead of old one, and setup them as
  one logical monitor, using technology called Eyefinity - it's a part
  of standard Radeon software. Now Windows thinks, that I have one
  monitor with resolution 2160x1920 (I bought Dell monitors with a thin
  borders and use them in portrait mode).

  Windows uses it without any problems, but mouse become crazy - sometimes (~3 
times from each 5) I can't move cursor to the right border of the screen, it 
looks like the invisible vertical border. I spent really huge amount of time to 
understand, which component is the root of problem and found, that it's really 
a mouse. I tried all possible variants (standard, tablet, virtio-mouse-pci, 
virtio-tablet-pci), and found, that in both mouse variants bug is reproducing, 
and in both tablet variants - cursor stuck near all real borders and corners, 
so it's not a variant too.
  The only working variant becomes passing real USB port to my VM and insert 
second mouse to this port. So, now it's working, but I have two mice on my 
working place, which doesn't seems very useful.

  Here is my command line:

  QEMU_AUDIO_DRV=pa QEMU_PA_SAMPLES=4096 qemu-system-x86_64 -enable-kvm -M q35 
-m 12168 -cpu host,kvm=off -smp 4,sockets=1,cores=4 \
  -bios /usr/share/qemu/bios.bin -rtc base=localtime -vga none -device 
secondary-vga \
id=virtiocd,if=none,format=raw,file=/home/akushsky/virtio-win-0.1.141.iso \
  -device driver=ide-cd,bus=ide.1,drive=virtiocd \
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 \
  -device virtio-scsi-pci,id=scsi \
 -device scsi-hd,drive=disk,id=scsi0 \
  -device ich9-intel-hda,bus=pcie.0,addr=1b.0,id=sound0 -device 
hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 \
  -usb -usbdevice host:046d:c52b

  All in all, I checked on Windows 7 and Windows 10, and on qemu 2.10
  and 2.11 - bug is always reproducible.

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