[Bug 1912944] [NEW] keyboard becomes unresponsive in some applications

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Since my upgrade to 20.10 I am sometimes seeing the keyboard becoming unresponsive (or very slowly responding) in some applications. At the moment emacs is in this state - menu events in emacs are fine. I've also seen this behaviour in konsole and firefox. I think the loss of keyboard happens after closing a window (but not always), so far I don't have a recipe for replicating.
I've seen bug #1912670 but I'm running plasma (and kde  5.74.0) and my mouse isn't affected - and the current hypothesis on that one is that it is xfce related.
In spite of keyboard not working, here I am typing (in the browser) without a problem. Sometimes  when it is unresponsive I'm seeing a c5sec delay before the keyboard event is acted upon rather than nothing at all happening.

lsb_release -rd
Description:    Ubuntu 20.10
Release:        20.10
I've just suspended the desktop and on un-sleeping the problem is still  present.

There's no messages in stdout/err for the current emacs session. CPU
doesn't look terribly busy. Suggestions on how to debug this are
welcome!

** Affects: meta-kde (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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keyboard becomes unresponsive in some applications
https://bugs.launchpad.net/bugs/1912944
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