High latency when using the Nvidia-Xorg driver

Upstream fix: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1263

New upstream fix: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1309

Fixed in mutter 40 by https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1726

Looks like the fix will be in mutter 3.38.4-1ubuntu1 (c4b68f70bdb)

This bug was fixed in the package mutter - 3.38.4-1ubuntu1

---------------
mutter (3.38.4-1ubuntu1) hirsute; urgency=medium

  * Merge with debian, containing new upstream release.
  * debian/tests: Adapt autopkgtest name and linked library to current soname
  * debian/tests/control: Update references to libmutter-7-dev
  * debian/patches: Remove Input Thread backport patches.
    It has been fun, but we decided to revert this, so here it is.
    (LP: #1918874, LP: #1919310)
  * debian/control: Set breaks on gnome-shell 3.38.4.
    That's the first version on which we'll remove the input thread patches
  * debian/libmutter-7-0.symbols: Revert symbol changes due to input thread
  * debian/patches: Add support for ABFR2101010 in v3d used by Raspberry Pi 4
    (LP: #1896171)
  * debian/patches: Handle NVIDIA's zero presentation times (LP: #1880086)
  * debian/patches: Properly handle configuration events on windows
    (LP: #191793)
  * Remaining changes with debian:
    - debian/gbp.conf: update upstream branch to point to ubuntu/master
    - debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      + X11: Add support for fractional scaling using Randr

mutter (3.38.4-1) unstable; urgency=medium

  * Team upload
  * New upstream release
    - Fix Wayland spec compliance when reordering subsurfaces.
      This is likely to be required by future Firefox versions in native
      Wayland mode.
    - Many other fixes that we already had via debian/patches
  * Drop most patches, included in the new upstream release

mutter (3.38.3-5) unstable; urgency=medium

  * Team upload

  [ Marco Trevisan (Treviño) ]
  * debian/patches: Include a missing commit from upstream gnome-3-38
    branch to fix X11 UI stutters

mutter (3.38.3-4) unstable; urgency=medium

  * Team upload

  [ Marco Trevisan (Treviño) ]
  * debian/patches: cherry-pick more upstream gnome-3-38 fixes
    - Correctly restore focus to applications that use globally active
      input handling, such as AWT/Swing Java apps
    - Disable double buffered shadow buffering, which was intended to
      improve performance with e.g. llvmpipe but currently makes it worse
  * debian/tests: Adapt autopkgtest name and linked library to current soname
  * debian/tests/control: Update references to libmutter-7-dev

  [ Simon McVittie ]
  * d/patches: Update to commit 3.38.3-26-g30c542ddc from gnome-3-38 branch
    - Fix X11 frame timing getting stuck if frames are skipped, resulting
      in X11 applications not always being redrawn when they should be
    - Fix a crash when clicking below titlebar with broken GTK themes

 -- Marco Trevisan (Treviño) <email address hidden> Fri, 26 Mar 2021 07:17:54 +0100