[Bug 198919] Xbox (One) Wireless Controller won't connect

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=198919

Kai Krakow (hurikhan77+bko@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |hurikhan77+bko@gmail.com

--- Comment #6 from Kai Krakow (hurikhan77+bko@gmail.com) ---
Yeah, it seems to get worse with every 5.4 LTS update. Worked almost flawless
about some months ago (despite taking something from 30-60s to successfully
connect). But I don't see a correlation to any commits. But now, it's almost
impossible to connect successfully, it usually disconnects after a 1-2 minutes
(coincidentally just when entering a game).

I usually also see messages like this:

During use of the controller (probably around disconnect time):
[ 5304.480502] Bluetooth: Unexpected continuation frame (len 52)

When plugging the BT dongle:
[ 5241.926752] Bluetooth: hci0: unexpected event for opcode 0x0000

While it's in a loop of constantly connecting and disconnecting:
[ 1120.736530] Bluetooth: hci0: hardware error 0x58
[ 1120.923550] debugfs: File 'le_min_key_size' in directory 'hci0' already
present!
[ 1120.923555] debugfs: File 'le_max_key_size' in directory 'hci0' already
present!
[ 1120.923557] debugfs: File 'force_bredr_smp' in directory 'hci0' already
present!

Other BT devices seem to just work fine tho I don't use a lot of them and only
occasionally. It seems that the Xbox One S firmware does something strange in
the BT protocol. It also needs either ERTM disabled to connect. Alternatively,
one can apply this patch to be able to use ERTM:

https://github.com/kakra/linux/commit/c8b24d83f227a7fecfa9420d6756074e8f9b542c

I'm also feeling there's some internal state getting messed up within the
controller on each BT pairing: Results are not really reproducible. I managed
to get it to work flawlessly one time (stable connection despite 20-30s connect
handshake time), then purged my Bluetooth config from /var/lib, re-paired the
controller and now it's a mess - still with the same kernel version.

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