[Qemu-devel] [Bug 1799792] [NEW] Broken scaling with gtk, gl=on on a hidpi display

[Qemu-devel] [Bug 1799792] [NEW] Broken scaling with gtk, gl=on on a hidpi display

[Sebastian Krzyszkowiak]

Public bug reported:

Tested on QEMU 3.0.0 on Arch Linux.

I'm using a hidpi screen, and therefore use those environment variables
in order to have GTK+ apps properly scaled:

GDK_SCALE=2
GDK_DPI_SCALE=0.5

However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
scale the window content properly, as seen on the attached screenshot.

Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
work fine.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot_20181024_222447.png"
   https://bugs.launchpad.net/bugs/1799792/+attachment/5205039/+files/Screenshot_20181024_222447.png

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Title:
  Broken scaling with gtk,gl=on on a hidpi display

Status in QEMU:
  New

Bug description:
  Tested on QEMU 3.0.0 on Arch Linux.

  I'm using a hidpi screen, and therefore use those environment
  variables in order to have GTK+ apps properly scaled:

  GDK_SCALE=2
  GDK_DPI_SCALE=0.5

  However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
  scale the window content properly, as seen on the attached screenshot.

  Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
  work fine.

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[Bug 1799792] Re: Broken scaling with gtk,gl=on on a hidpi display

[Ernst Sjöstrand]

Also happens on Ubuntu 19.10

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Title:
  Broken scaling with gtk,gl=on on a hidpi display

Status in QEMU:
  New

Bug description:
  Tested on QEMU 3.0.0 on Arch Linux.

  I'm using a hidpi screen, and therefore use those environment
  variables in order to have GTK+ apps properly scaled:

  GDK_SCALE=2
  GDK_DPI_SCALE=0.5

  However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
  scale the window content properly, as seen on the attached screenshot.

  Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
  work fine.

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[Bug 1799792] Re: Broken scaling with gtk,gl=on on a hidpi display

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another system. For this we need to know which bugs are still valid and which could be closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state back to "New" within the next 60 days, otherwise this report will be marked as "Expired". Or mark it as "Fix Released" if the problem has been solved with a newer version of QEMU already. Thank you and sorry for the inconvenience.

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

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Title:
  Broken scaling with gtk,gl=on on a hidpi display

Status in QEMU:
  Incomplete

Bug description:
  Tested on QEMU 3.0.0 on Arch Linux.

  I'm using a hidpi screen, and therefore use those environment
  variables in order to have GTK+ apps properly scaled:

  GDK_SCALE=2
  GDK_DPI_SCALE=0.5

  However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
  scale the window content properly, as seen on the attached screenshot.

  Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
  work fine.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1799792/+subscriptions

[Bug 1799792] Re: Broken scaling with gtk,gl=on on a hidpi display

[Sebastian Krzyszkowiak]

Still happening in QEMU 5.1.0

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

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Title:
  Broken scaling with gtk,gl=on on a hidpi display

Status in QEMU:
  New

Bug description:
  Tested on QEMU 3.0.0 on Arch Linux.

  I'm using a hidpi screen, and therefore use those environment
  variables in order to have GTK+ apps properly scaled:

  GDK_SCALE=2
  GDK_DPI_SCALE=0.5

  However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
  scale the window content properly, as seen on the attached screenshot.

  Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
  work fine.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1799792/+subscriptions

[Bug 1799792] Re: Broken scaling with gtk,gl=on on a hidpi display

[lilydjwg]

I have the same issue, but unfortunately I cannot work around it: gl=off
doesn't work with vfio-display-dmabuf, and sdl segfaults when the guest
OS tries to enter GUI.

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Title:
  Broken scaling with gtk,gl=on on a hidpi display

Status in QEMU:
  New

Bug description:
  Tested on QEMU 3.0.0 on Arch Linux.

  I'm using a hidpi screen, and therefore use those environment
  variables in order to have GTK+ apps properly scaled:

  GDK_SCALE=2
  GDK_DPI_SCALE=0.5

  However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
  scale the window content properly, as seen on the attached screenshot.

  Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
  work fine.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1799792/+subscriptions

[Bug 1799792] Re: Broken scaling with gtk,gl=on on a hidpi display

[lilydjwg]

unset GDK_SCALE GDK_DPI_SCALE works for me. It was GDK_SCALE=2
GDK_DPI_SCALE=0.5 as KDE would have set.

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Title:
  Broken scaling with gtk,gl=on on a hidpi display

Status in QEMU:
  New

Bug description:
  Tested on QEMU 3.0.0 on Arch Linux.

  I'm using a hidpi screen, and therefore use those environment
  variables in order to have GTK+ apps properly scaled:

  GDK_SCALE=2
  GDK_DPI_SCALE=0.5

  However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
  scale the window content properly, as seen on the attached screenshot.

  Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
  work fine.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1799792/+subscriptions

[Bug 1799792] Re: Broken scaling with gtk,gl=on on a hidpi display

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/262


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

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #262
   https://gitlab.com/qemu-project/qemu/-/issues/262

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Title:
  Broken scaling with gtk,gl=on on a hidpi display

Status in QEMU:
  Expired

Bug description:
  Tested on QEMU 3.0.0 on Arch Linux.

  I'm using a hidpi screen, and therefore use those environment
  variables in order to have GTK+ apps properly scaled:

  GDK_SCALE=2
  GDK_DPI_SCALE=0.5

  However, QEMU, when launched with "-display gtk,gl=on" option, doesn't
  scale the window content properly, as seen on the attached screenshot.

  Switching to "-display gtk,gl=off" and "-display sdl,gl=on" makes it
  work fine.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1799792/+subscriptions