[Bug 2037019] [NEW] Full-screen youtube hangs desktop

[Dave Jones]

Public bug reported:

On the current Mantic beta images of Ubuntu Desktop for Raspberry Pi,
running on a Raspberry Pi 4B (either 4GB or 8GB), while attempting to
play a YouTube video (as part of the ISO test procedure), attempting to
switch the video to full-screen resulted in a hang of the desktop.

More precisely, I could still pause and resume the video with the
spacebar (audio could be heard stopping or playing accordingly) but the
display was frozen entirely, including the mouse pointer and I was
unable to recover the desktop (attempting to switch to another virtual
console with Ctrl+ a function key was unsuccessful, attempting keyboard
shortcuts to shut down firefox, etc).

At the point that the desktop freezes the following messages appeared in
journalctl (obtained over SSH):

Sep 21 22:05:52 miss-piggy kernel: vc4-drm gpu: swiotlb buffer is full (sz: 524288 bytes), total 32768 (slots), used 2104 (slots)
Sep 21 22:05:52 miss-piggy kernel: vc4-drm gpu: swiotlb buffer is full (sz: 524288 bytes), total 32768 (slots), used 2040 (slots)

The system is still responsive inasmuch as I can connect via SSH and
kill the firefox process, but the desktop remains inaccessible. So far
the only thing I've found that can bring it back is restarted the gdm
service (effectively killing the running desktop) over SSH.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: raspi-image rls-mm-incoming

** Tags added: raspi-image rls-mm-incoming

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https://bugs.launchpad.net/bugs/2037019

Title:
  Full-screen youtube hangs desktop

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