[arch-general] Bluetooth no more working after update

[Peter Nabbefeld]

Hello,

after updating my arch installation, bluetooth stopped working.
"systemctl status bluetooth" shows the service is active, but when I try
to power on or list my bluetooth device using bluetoothctl, no device is
found.

Head lines of dmesg output:

[ 2951.799457] usb 3-4: New USB device strings: Mfr=0, Product=0,
SerialNumber=0
[ 2953.533019] usb 3-4: USB disconnect, device number 75
[ 2953.811506] Bluetooth: hci0: command 0x0c03 tx timeout
[ 2956.823879] audit: type=1131 audit(1629640847.196:664): pid=1 uid=0
auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[ 2961.918096] Bluetooth: hci0: sending initial HCI reset command failed
(-110)
[ 2961.926281] audit: type=1130 audit(1629640852.299:665): pid=1 uid=0
auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[ 2962.174751] usb 3-4: new full-speed USB device number 76 using xhci_hcd
[ 2962.298118] usb 3-4: device descriptor read/64, error -71
[ 2962.528098] usb 3-4: device descriptor read/64, error -71
[ 2962.761408] usb 3-4: new full-speed USB device number 77 using xhci_hcd
[peter at tuchola ~]$ sudo dmesg | head -n 20
[ 2999.934381] usb 3-4: new full-speed USB device number 88 using xhci_hcd
[ 3000.057683] usb 3-4: device descriptor read/64, error -71
[ 3000.287770] usb 3-4: device descriptor read/64, error -71
[ 3000.517708] usb 3-4: new full-speed USB device number 89 using xhci_hcd
[ 3000.641059] usb 3-4: device descriptor read/64, error -71
[ 3000.871018] usb 3-4: device descriptor read/64, error -71
[ 3000.977743] usb usb3-port4: attempt power cycle
[ 3001.381075] usb 3-4: new full-speed USB device number 90 using xhci_hcd
[ 3001.381293] usb 3-4: Device not responding to setup address.
[ 3001.587720] usb 3-4: Device not responding to setup address.
[ 3001.794365] usb 3-4: device not accepting address 90, error -71
[ 3002.124364] usb 3-4: new full-speed USB device number 91 using xhci_hcd
[ 3002.142567] usb 3-4: New USB device found, idVendor=8087,
idProduct=07dc, bcdDevice= 0.01
[ 3002.142573] usb 3-4: New USB device strings: Mfr=0, Product=0,
SerialNumber=0
[ 3003.876301] usb 3-4: USB disconnect, device number 91
[ 3004.157679] Bluetooth: hci0: command 0x0c03 tx timeout
[ 3007.165585] audit: type=1131 audit(1629640897.539:672): pid=1 uid=0
auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[ 3012.264321] Bluetooth: hci0: sending initial HCI reset command failed
(-110)
[ 3012.273674] audit: type=1130 audit(1629640902.646:673): pid=1 uid=0
auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[ 3012.520945] usb 3-4: new full-speed USB device number 92 using xhci_hcd


My bluetooth device:
Bus 003 Device 103: ID 8087:07dc Intel Corp. Bluetooth wireless interface


"lsusb -v" shows lots of details, e.g.

Device Descriptor:
   bLength                18
   bDescriptorType         1
   bcdUSB               2.00
   bDeviceClass          224 Wireless
   bDeviceSubClass         1 Radio Frequency
   bDeviceProtocol         1 Bluetooth
   bMaxPacketSize0        64
   idVendor           0x8087 Intel Corp.
   idProduct          0x07dc Bluetooth wireless interface
   bcdDevice            0.01
   iManufacturer           0
   iProduct                0
   iSerial                 0
   bNumConfigurations      1
...

but ends with the following lines:
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
cannot read device status, No such device (19)

I guess there's sth. broken with the driver (or now driver assigned at all).

When looking into /usr/lib/firmware, I see many if not all updates of
August, 18th, and especially many files with pattern "iwlwifi-*.ucode",
which might related to my problem.

I already searched the internet, but couldn't find anything useful :-/

However, I found this:
https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1591167

While it seems not to be the same, it led me to looking for ibt-*.* and
especially to
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/intel

I found those files locally in /usr/lib/firmware/intel, same date for
latest update as for "iwlwifi-*.ucode", so everything should usually be
fine.

How can I check, if the firmware has been installed/loaded properly?
How can I find out, which is the correct firmware?


Kind regards
Peter