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Date: Thu, 30 Nov 2023 20:54:09 -0500
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From: "Kris Karas (Bug Reporting)" <bugs-a21@moonlit-rail.com>
To: linux-bluetooth@vger.kernel.org
Subject: Regression: Inoperative bluetooth, Intel chipset, mainline kernel
 6.6.2+
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Greetings -

With mainline kernel 6.6.2+ (and 6.1.63, etc), bluetooth is inoperative 
(reports "opcode 0x0c03 failed") on my motherboard's bluetooth adapter 
(Intel chipset).  Details below.

I reported this in a comment tacked onto bugzilla #218142, but got no 
response, so posting here as a possibly new issue.

Details, original email:
----------------------------------------------------------------------
I have a regression going from mainline kernel 6.1.62 to 6.1.63, and 
also from kernel 6.6.1 to 6.6.2; I can bisect if patch authors can't 
locate the relevant commit.  In the most recent kernels mentioned, 
bluetooth won't function.

Hardware: ASRock "X470 Taichi" motherboard - on board chipset.
lsusb: ID 8087:0aa7 Intel Corp. Wireless-AC 3168 Bluetooth.
dmesg: Bluetooth: hci0: Legacy ROM 2.x revision 5.0 build 25 week 20 2015
        Bluetooth: hci0: Intel Bluetooth firmware file:
          intel/ibt-hw-37.8.10-fw-22.50.19.14.f.bseq
        Bluetooth: hci0: Intel BT fw patch 0x43 completed & activated
bluez: Version 5.70, bluez firmware version 1.2
Linux kernel firmware: 20231117_7124ce3

On a working kernel (such as 6.6.1), in addition to the dmesg output 
above, we have this:
dmesg: Bluetooth: MGMT ver 1.22
        Bluetooth: hci0: Bad flag given (0x1) vs supported (0x0)

On a failed kernel (such as 6.6.2), instead of the good output above, we 
have:
dmesg: Bluetooth: hci0: Opcode 0x0c03 failed: -110
        Bluetooth: hci0: Opcode 0x0c03 failed: -110
        ...
repeats several times as bluez attempts to communicate with hci0.
----------------------------------------------------------------------

Since that email was sent, kernel firmware has been updated to 
20231128_aae6052, and kernels 6.1.64 and 6.6.3 have been tried with no 
change observed.

Kris