[Bug 217475] Foxconn / Hon Hai Bluetooth adapter 0489:e0cd stops working on ThinkPad T14s AMD Gen1

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217475

--- Comment #2 from Alberto Garcia (berto@igalia.com) ---
I have always had this problem with this computer. Linux got support for this
Bluetooth adapter in 5.14 if I'm not wrong (64832df2ac05) and I probably tried
it for the first time with 5.15.3. I never saw it working fine, and I have
tried lots of kernels and firmware versions since then. The most recent one was
6.3.3 as I mentioned in the bug report.

Since I can make it work with a Windows VM using USB passthrough I assume that
there's some problem with the initialization of the adapter, the HCI or
something like that, but that's all I can guess with my limited knowledge of
USB.

To make it clear: when I talk about using a VM I'm talking about the scenario
where

1) I cannot use Bluetooth in my Linux system because of one of the errors that
I mentioned earlier ("hci0: Failed to get device id (-108)"). The device is not
detected by the Bluetooth stack although it does appears in lsusb.
2) I launch a Windows VM using QEMU right away, without rebooting the computer
or doing anything else. The BT adapter works in that VM always.
3) If I launch a Linux VM instead it tends to work, not always in this case but
I have a higher success rate than if I remove and reload the btusb module on
the host.

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