[Bug 60824] [PATCH][regression] Cambridge Silicon Radio, Ltd Bluetooth Dongle unusable

https://bugzilla.kernel.org/show_bug.cgi?id=60824

--- Comment #183 from Swyter (swyterzone@gmail.com) ---

It ended up being included starting with Linux v5.9-rc1 in July last year, I
think I originally tested it with a late v5.7 or v5.8 kernel. Then it regressed
shortly afterwards. ¯\_(ツ)_/¯

That's why I said a few months ago that trying to find what broke it is a good
start point. Solving it seems like a matter of finding the culprit by narrowing
down the range of changes between a known working point and now. Then it should
be a matter of testing and sending a small patch that builds onto what's
already there in less than ten lines, adding one or more missing quirks.

If I were to start working on another fix now I would also compare the packet
flow between the Windows and Linux Bluetooth stacks and see what's up and why
it locks up after receiving very trivial stuff. Linux is probably doing
something extra. :)

Comment #165 here and above (testing getting rid of the event filter thingie)
seems also like a good candidate to expand the quirk list:
https://bugzilla.kernel.org/show_bug.cgi?id=60824#c165

Food for thought.

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