No default controller available (Bluetooth)

Support Network
1

image

➜ rfkill list
0: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no
2: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no

➜ sudo dmesg | grep blue

[sudo] password for daysling: 
[   49.105120] audit: type=1131 audit(1671277903.598:171): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=unconfined msg='unit=blueman-mechanism comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[  402.401478] audit: type=1131 audit(1671278256.891:283): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=unconfined msg='unit=bluetooth comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[  402.425105] audit: type=1130 audit(1671278256.918:284): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=unconfined msg='unit=bluetooth comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

➜ lsusb              
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root 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 0bda:b00e Realtek Semiconductor Corp. Bluetooth Radio 
Bus 001 Device 003: ID 0408:5365 Quanta Computer, Inc. HP TrueVision HD Camera
Bus 001 Device 002: ID 258a:1007 SINOWEALTH Wired Gaming Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


Bus 001 Device 004: ID 0bda:b00e Realtek Semiconductor Corp. Bluetooth Radio 
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass          224 Wireless
  bDeviceSubClass         1 Radio Frequency
  bDeviceProtocol         1 Bluetooth
  bMaxPacketSize0        64
  idVendor           0x0bda Realtek Semiconductor Corp.
  idProduct          0xb00e 
  bcdDevice            1.10
  iManufacturer           1 Realtek 
  iProduct                2 Bluetooth Radio 
  iSerial                 3 00e04c000001
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x00b1
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0009  1x 9 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0009  1x 9 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       2
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0011  1x 17 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0011  1x 17 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       3
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0019  1x 25 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0019  1x 25 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       4
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0021  1x 33 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0021  1x 33 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       5
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0031  1x 49 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0031  1x 49 bytes
        bInterval               1
2

… case sensitive - the messages are about “Bluetooth”, not about “bluetooth” :wink:

You might get more context with:

sudo dmesg | less
and the using the search inside less

Other than that I can only refer you to the Arch wiki:

Bluetooth - ArchWiki

3 
➜ sudo dmesg | grep -i blue
[sudo] password for daysling: 
[    2.047365] usb 1-4: Product: Bluetooth Radio 
[    4.115029] Bluetooth: Core ver 2.22
[    4.115055] NET: Registered PF_BLUETOOTH protocol family
[    4.115056] Bluetooth: HCI device and connection manager initialized
[    4.115060] Bluetooth: HCI socket layer initialized
[    4.115061] Bluetooth: L2CAP socket layer initialized
[    4.115064] Bluetooth: SCO socket layer initialized
[    4.281382] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    4.281386] Bluetooth: BNEP filters: protocol multicast
[    4.281390] Bluetooth: BNEP socket layer initialized
[    4.451427] Bluetooth: hci0: RTL: examining hci_ver=08 hci_rev=000c lmp_ver=08 lmp_subver=8821
[    4.452343] Bluetooth: hci0: RTL: rom_version status=0 version=1
[    4.452355] Bluetooth: hci0: RTL: loading rtl_bt/rtl8821c_fw.bin
[    4.454106] Bluetooth: hci0: RTL: loading rtl_bt/rtl8821c_config.bin
[    4.454267] Bluetooth: hci0: RTL: cfg_sz 10, total sz 31990
[    5.031342] Bluetooth: hci0: RTL: fw version 0x829a7644
[   49.105120] audit: type=1131 audit(1671277903.598:171): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=unconfined msg='unit=blueman-mechanism comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[  206.645070] Bluetooth: hci0: command 0x0c14 tx timeout
[  208.778403] Bluetooth: hci0: command 0x0c23 tx timeout
[  402.401478] audit: type=1131 audit(1671278256.891:283): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=unconfined msg='unit=bluetooth comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[  402.425105] audit: type=1130 audit(1671278256.918:284): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=unconfined msg='unit=bluetooth comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[  550.324849] Bluetooth: hci0: command 0x0c14 tx timeout
[  552.458120] Bluetooth: hci0: command 0x0c23 tx timeout
[  623.637390] Bluetooth: hci0: RTL: examining hci_ver=08 hci_rev=000c lmp_ver=08 lmp_subver=8821
[  623.638136] Bluetooth: hci0: RTL: rom_version status=0 version=1
[  623.638173] Bluetooth: hci0: RTL: loading rtl_bt/rtl8821c_fw.bin
[  623.638301] Bluetooth: hci0: RTL: loading rtl_bt/rtl8821c_config.bin
[  623.638344] Bluetooth: hci0: RTL: cfg_sz 10, total sz 31990
[  624.217848] Bluetooth: hci0: RTL: fw version 0x829a7644