[Bug 218142] Bluetooth adapter fails to recognize on kernel 5.15.0-88-generic

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218142

--- Comment #3 from Kris Karas (bugs-a21@moonlit-rail.com) ---
I'm still not sure whether the bug I reported in comment 2, above, is the same
issue as reported by Zach (the OP).  But in my specific case, the culprit has
been identified (via an 8-step kernel bisection) to the following:

-----------------------------------------------
commit 14a51fa544225deb9ac2f1f9f3c10dedb29f5d2f
Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Date:   Thu Oct 19 13:29:19 2023 +0300

    xhci: Loosen RPM as default policy to cover for AMD xHC 1.1

    [ Upstream commit 4baf1218150985ee3ab0a27220456a1f027ea0ac ]

    The AMD USB host controller (1022:43f7) isn't going into PCI D3 by default
    without anything connected. This is because the policy that was introduced
    by commit a611bf473d1f ("xhci-pci: Set runtime PM as default policy on all
    xHC 1.2 or later devices") only covered 1.2 or later.
-----------------------------------------------

Interestingly, this bug is not about bluetooth per se, but rather the USB
hardware (XHCI) that handles communication with the bluetooth chipset.

It would be most helpful if the OP, Zach, could chime in here about the details
of his particular setup, so we can identify whether it might be this bug or
some other.

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