After updating my kernel from 5.15 to 5.16, Bluetooth wouldn’t enable. This is a continual issue with 5.18. I have had success re-enabling it in 5.15, but after a few restarts, it suddenly fails again
$ dmesg | egrep -i "(intel|bluetooth)"
[ 0.025780] Reserving Intel graphics memory at [mem 0x8b800000-0x8f7fffff]
[ 0.107507] smpboot: CPU0: Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz (family: 0x6, model: 0x9e, stepping: 0xa)
[ 0.107622] Performance Events: PEBS fmt3+, Skylake events, 32-deep LBR, full-width counters, Intel PMU driver.
[ 0.453066] intel_pstate: Intel P-state driver initializing
[ 0.453735] intel_pstate: Disabling energy efficiency optimization
[ 0.453735] intel_pstate: HWP enabled
[ 0.454978] intel_pmc_core INT33A1:00: initialized
[ 2.392604] intel-lpss 0000:00:15.0: enabling device (0000 -> 0002)
[ 2.392952] idma64 idma64.0: Found Intel integrated DMA 64-bit
[ 2.404130] intel-lpss 0000:00:15.1: enabling device (0000 -> 0002)
[ 2.405145] idma64 idma64.1: Found Intel integrated DMA 64-bit
[ 2.414219] intel-lpss 0000:00:1e.0: enabling device (0000 -> 0002)
[ 2.414646] idma64 idma64.2: Found Intel integrated DMA 64-bit
[ 2.783617] Intel(R) Wireless WiFi driver for Linux
[ 2.912189] snd_hda_intel 0000:01:00.1: Disabling MSI
[ 2.912196] snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client
[ 3.164948] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 3.194714] iTCO_wdt iTCO_wdt: Found a Intel PCH TCO device (Version=6, TCOBASE=0x0400)
[ 3.217769] iwlwifi 0000:00:14.3: Detected Intel(R) Wireless-AC 9560 160MHz, REV=0x312
[ 3.221727] Bluetooth: Core ver 2.22
[ 3.221740] NET: Registered PF_BLUETOOTH protocol family
[ 3.221741] Bluetooth: HCI device and connection manager initialized
[ 3.221743] Bluetooth: HCI socket layer initialized
[ 3.221745] Bluetooth: L2CAP socket layer initialized
[ 3.221747] Bluetooth: SCO socket layer initialized
[ 3.377287] intel_tcc_cooling: Programmable TCC Offset detected
[ 3.762310] intel_rapl_common: Found RAPL domain package
[ 3.762311] intel_rapl_common: Found RAPL domain core
[ 3.762312] intel_rapl_common: Found RAPL domain uncore
[ 3.762312] intel_rapl_common: Found RAPL domain dram
[ 4.485939] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input20
[ 4.502208] Bluetooth: hci0: Bootloader revision 0.1 build 42 week 52 2015
[ 4.503207] Bluetooth: hci0: Device revision is 2
[ 4.503209] Bluetooth: hci0: Secure boot is enabled
[ 4.503210] Bluetooth: hci0: OTP lock is enabled
[ 4.503211] Bluetooth: hci0: API lock is enabled
[ 4.503212] Bluetooth: hci0: Debug lock is disabled
[ 4.503213] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 4.505745] Bluetooth: hci0: Found device firmware: intel/ibt-17-16-1.sfi
[ 4.505770] Bluetooth: hci0: Boot Address: 0x40800
[ 4.505771] Bluetooth: hci0: Firmware Version: 214-6.22
[ 5.663798] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 5.663800] Bluetooth: BNEP filters: protocol multicast
[ 5.663803] Bluetooth: BNEP socket layer initialized
[ 5.973658] Bluetooth: hci0: Waiting for firmware download to complete
[ 5.974171] Bluetooth: hci0: Firmware loading failed
[ 5.975178] Bluetooth: hci0: MSFT supported features length mismatch
$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0408:a060 Quanta Computer, Inc. HD Webcam
Bus 001 Device 002: ID 045e:07a5 Microsoft Corp. Wireless Receiver 1461C
Bus 001 Device 004: ID 8087:0aaa Intel Corp. Bluetooth 9460/9560 Jefferson Peak (JfP)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
$ bluetoothctl show
No default controller available