Ubuntu HowTo: Bluetooth not working (no adapters found) – ROG CROSSHAIR VIII HERO – AX200 – iwlwifi works however

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My PC:

{21:26}~ ➭ uname -a
Linux trunk3 5.3.0-40-generic #32-Ubuntu SMP Fri Jan 31 20:24:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

{21:27}~ ➭ inxi -Fz
System:    Host: trunk3 Kernel: 5.3.0-40-generic x86_64 bits: 64 Desktop: KDE Plasma 5.16.5 Distro: Ubuntu 19.10 (Eoan Ermine) 
Machine:   Type: Desktop Mobo: ASUSTeK model: ROG CROSSHAIR VIII HERO (WI-FI) v: Rev X.0x serial: <filter> 
           UEFI: American Megatrends v: 0803 date: 08/01/2019 
CPU:       Topology: 12-Core model: AMD Ryzen 9 3900X bits: 64 type: MT MCP L2 cache: 6144 KiB 
[...]
Network:   Device-1: Realtek driver: N/A 
           Device-2: Intel I211 Gigabit Network driver: igb 
           IF: enp5s0 state: down mac: <filter> 
           Device-3: Intel driver: iwlwifi 
           IF: wlp6s0 state: up mac: <filter> 

Status: WiFi is working (currently connected over wifi only)

Problem: Bluetooth reports “no adapters found”.

What I tried:

{21:35}~ ➭ lspci | grep Net
06:00.0 Network controller: Intel Corporation Device 2723 (rev 1a)

{21:35}~ ➭ modprobe -c | grep 2723
alias pci:v00008086d00002723sv*sd00000080bc*sc*i* iwlwifi
[...]

{21:37}~ ➭ dmesg | grep iwl
[    3.304538] iwlwifi 0000:06:00.0: enabling device (0000 -> 0002)
[    3.329819] iwlwifi 0000:06:00.0: TLV_FW_FSEQ_VERSION: FSEQ Version: 43.2.23.17
[    3.329823] iwlwifi 0000:06:00.0: Found debug destination: EXTERNAL_DRAM
[    3.329824] iwlwifi 0000:06:00.0: Found debug configuration: 0
[    3.330042] iwlwifi 0000:06:00.0: loaded firmware version 48.4fa0041f.0 op_mode iwlmvm
[    3.346453] iwlwifi 0000:06:00.0: Detected Intel(R) Wi-Fi 6 AX200 160MHz, REV=0x340
[    3.357723] iwlwifi 0000:06:00.0: Applying debug destination EXTERNAL_DRAM
[    3.358098] iwlwifi 0000:06:00.0: Allocated 0x00400000 bytes for firmware monitor.
[    3.505318] iwlwifi 0000:06:00.0: base HW address: dc:71:96:88:62:83
[    3.519954] iwlwifi 0000:06:00.0 wlp6s0: renamed from wlan0
[    4.522491] iwlwifi 0000:06:00.0: Applying debug destination EXTERNAL_DRAM
[    4.670133] iwlwifi 0000:06:00.0: FW already configured (0) - re-configuring
[    8.219398] iwlwifi 0000:06:00.0: Unhandled alg: 0x707

and also

{21:41}~ ➭ bluetoothctl
Agent registered
[bluetooth]# scan on
No default controller available
[bluetooth]# list
[bluetooth]# quit

{21:42}~ ➭ ll /lib/modules/5.3.0-40-generic/kernel/drivers/bluetooth/
insgesamt 748K
-rw-r--r-- 1 root root  25K Jan 31 19:32 ath3k.ko
-rw-r--r-- 1 root root  13K Jan 31 19:32 bcm203x.ko
-rw-r--r-- 1 root root  26K Jan 31 19:32 bfusb.ko
-rw-r--r-- 1 root root  16K Jan 31 19:32 bluecard_cs.ko
-rw-r--r-- 1 root root  20K Jan 31 19:32 bpa10x.ko
-rw-r--r-- 1 root root  15K Jan 31 19:32 bt3c_cs.ko
-rw-r--r-- 1 root root  16K Jan 31 19:32 btbcm.ko
-rw-r--r-- 1 root root  24K Jan 31 19:32 btintel.ko
-rw-r--r-- 1 root root  36K Jan 31 19:32 btmrvl.ko
-rw-r--r-- 1 root root  42K Jan 31 19:32 btmrvl_sdio.ko
-rw-r--r-- 1 root root  24K Jan 31 19:32 btmtksdio.ko
-rw-r--r-- 1 root root 6,5K Jan 31 19:32 btmtkuart.ko
-rw-r--r-- 1 root root  23K Jan 31 19:32 btqca.ko
-rw-r--r-- 1 root root 8,5K Jan 31 19:32 btrsi.ko
-rw-r--r-- 1 root root  21K Jan 31 19:32 btrtl.ko
-rw-r--r-- 1 root root  16K Jan 31 19:32 btsdio.ko
-rw-r--r-- 1 root root  83K Jan 31 19:32 btusb.ko
-rw-r--r-- 1 root root  13K Jan 31 19:32 btwilink.ko
-rw-r--r-- 1 root root  14K Jan 31 19:32 dtl1_cs.ko
-rw-r--r-- 1 root root  26K Jan 31 19:32 hci_nokia.ko
-rw-r--r-- 1 root root 233K Jan 31 19:32 hci_uart.ko
-rw-r--r-- 1 root root  14K Jan 31 19:32 hci_vhci.ko

No wireless dongles are attached via USB:

{22:11}~ ➭ lsusb
Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 007 Device 004: ID 04a9:176b Canon, Inc. PIXMA MX920 Series
Bus 007 Device 003: ID 046d:c051 Logitech, Inc. G3 (MX518) Optical Mouse
Bus 007 Device 002: ID 05af:0802 Jing-Mold Enterprise Co., Ltd USB Keyboard
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 003: ID 05e3:0732 Genesys Logic, Inc. All-in-One Cardreader
Bus 004 Device 002: ID 174c:3074 ASMedia Technology Inc. ASM1074 SuperSpeed hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 174c:2074 ASMedia Technology Inc. ASM1074 High-Speed hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 8087:0029 Intel Corp. 
Bus 001 Device 005: ID 0b05:18f3 ASUSTek Computer, Inc. 
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 002: ID 28de:1142 Valve Software Wireless Steam Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I also installed bluez-tools and bluez-tests, but do not currently know how to use them or whether they are useful. Bluetooth is set to enabled in the BIOS/UEFI.

{21:52}~ ➭ dmesg | grep -i blue
[    3.311096] Bluetooth: Core ver 2.22
[    3.311124] Bluetooth: HCI device and connection manager initialized
[    3.311126] Bluetooth: HCI socket layer initialized
[    3.311128] Bluetooth: L2CAP socket layer initialized
[    3.311129] Bluetooth: SCO socket layer initialized
[    4.272042] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    4.272044] Bluetooth: BNEP filters: protocol multicast
[    4.272049] Bluetooth: BNEP socket layer initialized
[    5.330777] Bluetooth: hci0: Reading Intel version information failed (-110)
[    5.331075] Bluetooth: hci0: command tx timeout

Any hints on further debugging?

Update 2020-05-31

I also installed kubuntu 20.04 LTS, with no change:

{16:26}~ ➭ uname -a
Linux trunk3 5.4.0-33-generic #37-Ubuntu SMP Thu May 21 12:53:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

{16:26}~ ➭ inxi -Fz
System:    Kernel: 5.4.0-33-generic x86_64 bits: 64 Desktop: KDE Plasma 5.18.5 Distro: Ubuntu 20.04 LTS (Focal Fossa)
Machine:   Type: Desktop Mobo: ASUSTeK model: ROG CROSSHAIR VIII HERO (WI-FI) v: Rev X.0x serial: <filter>
           UEFI: American Megatrends v: 0803 date: 08/01/2019
Network:   Device-1: Realtek RTL8125 2.5GbE driver: r8169
           IF: enp4s0 state: down mac: <filter> 
           Device-2: Intel I211 Gigabit Network driver: igb 
           IF: enp5s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
           Device-3: Intel Wi-Fi 6 AX200 driver: iwlwifi 
           IF: wlp6s0 state: down mac: <filter> 

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