[Bug 221832] MT7925 (Foxcon T99H493.03) BT missing in lsusb on Vivobook S16

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221832

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED
          Component|Bluetooth                   |ARM
           Assignee|linux-bluetooth@vger.kernel |linux-arm-kernel@lists.arm.
                   |.org                        |linux.org.uk
            Product|Drivers                     |Platform Specific/Hardware

--- Comment #10 from Artem S. Tashkinov (aros@gmx.com) ---
Most likely root causes (in order of probability)

* USB pins not wired / not enabled for this card on the Vivobook's M.2 slot.
Many laptops only fully support the original vendor's card. The fact that the
previous Qualcomm card's BT worked does not guarantee the USB signals are
present or powered for a different vendor's card.
 * Missing or incorrect device-tree / ACPI description for the MT7925 Bluetooth
function (power regulators, GPIO resets, USB hub ports, etc.).
 * Kernel is still trying to talk to the old Qualcomm BT (WCN7850) because the
platform firmware or DT still describes the original card.

Reassigning to the platform subsystem because it's unlikely that the bt driver
can do anything about this considering it's not even initialized properly.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are the assignee for the bug.