[Bug 1906185] Re: Guest display resolution cannot be changed when using certain graphics/interface combinations

[Launchpad Bug Tracker]

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

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

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https://bugs.launchpad.net/bugs/1906185

Title:
  Guest display resolution cannot be changed when using certain
  graphics/interface combinations

Status in QEMU:
  Expired

Bug description:
  Guest display resolution cannot be changed with certain virtual
  graphics card (-vga) and interface (-display) combinations.

  For example, resolution changing doesn't work with the following QEMU
  start commands, it resets to the default resolution immediately:

  QXL with SDL interface:
  qemu-system-x86_64 -enable-kvm -m 6G -cpu host -smp 3 -cdrom 
./linux/kubuntu-20.04-desktop-amd64.iso -boot d -vga qxl -soundhw hda -display 
sdl

  QXL with GTK interface:
  qemu-system-x86_64 -enable-kvm -m 6G -cpu host -smp 3 -cdrom 
./linux/kubuntu-20.04-desktop-amd64.iso -boot d -vga qxl -soundhw hda -display 
gtk

  QXL with "remote" SPICE interface via unix socket:
  qemu-system-x86_64 -enable-kvm -m 6G -cpu host -smp 3 -cdrom 
./linux/kubuntu-20.04-desktop-amd64.iso -boot d -soundhw hda -vga qxl -device 
virtio-serial-pci -device 
virtserialport,chardev=spicechannel0,name=com.redhat.spice.0 -chardev 
spicevmc,id=spicechannel0,name=vdagent -spice 
unix,addr=/tmp/vm_spice.socket,disable-ticketing

  for "remote" access:
  remote-viewer spice+unix:///tmp/vm_spice.socket


  Other tested combinations:
  -- virtio + SDL (GL on): works!
  -- virtio + GTK (GL on): does not work properly. The resolution is changed 
but window size is not so the guest screen will look like garbage.
  -- vmware: The initial Kubuntu setup screen is visible but booting does not 
progress to the desktop
  -- std + GTK: works!
  -- std + SDL: works!

  
  QEMU version: 5.1.0
  Guest: Kubuntu 20.04 64-bit (live) with 5.4.0-26 kernel; may occur with other 
guests as well
  Host: Arch Linux, with KDE desktop

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