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[Bug 1886306] [NEW] qemu running slow when the window is in background


From: Philippe Mathieu-Daudé
Subject: [Bug 1886306] [NEW] qemu running slow when the window is in background
Date: Sun, 05 Jul 2020 09:12:19 -0000

Public bug reported:

Reported by <jedinix> on IRC:

QEMU almost freezes when running with `GDK_BACKEND=x11` set and the
parameter `gl=on` added to the `-display` option.

GDK_BACKEND=x11 qemu-system-x86_64 -nodefaults -no-user-config -enable-
kvm -machine q35 -cpu host -m 4G -display gtk,gl=on -vga std -usb
-device usb-kbd -drive file=/tmp/Win10.qcow2,media=disk,format=qcow2
-drive
file=~/Downloads/Win10_2004_EnglishInternational_x64.iso,media=cdrom

Leaving out `GDK_BACKEND=x11` or `gl=on` fixes the issue.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1886306

Title:
  qemu running slow when the window is in background

Status in QEMU:
  New

Bug description:
  Reported by <jedinix> on IRC:

  QEMU almost freezes when running with `GDK_BACKEND=x11` set and the
  parameter `gl=on` added to the `-display` option.

  GDK_BACKEND=x11 qemu-system-x86_64 -nodefaults -no-user-config
  -enable-kvm -machine q35 -cpu host -m 4G -display gtk,gl=on -vga std
  -usb -device usb-kbd -drive
  file=/tmp/Win10.qcow2,media=disk,format=qcow2 -drive
  file=~/Downloads/Win10_2004_EnglishInternational_x64.iso,media=cdrom

  Leaving out `GDK_BACKEND=x11` or `gl=on` fixes the issue.

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