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From: johannes <1906185@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1906185] [NEW] Guest display resolution cannot be changed when using certain graphics/interface combinations
Date: Sun, 29 Nov 2020 21:25:28 -0000	[thread overview]
Message-ID: <160668512846.21904.17586532859181577922.malonedeb@gac.canonical.com> (raw)

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: graphics resolution

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1906185

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

Status in QEMU:
  New

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1906185/+subscriptions


             reply	other threads:[~2020-11-29 21:32 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-29 21:25 johannes [this message]
2021-05-10  4:45 ` [Bug 1906185] Re: Guest display resolution cannot be changed when using certain graphics/interface combinations Thomas Huth
2021-07-10  4:17 ` Launchpad Bug Tracker

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