dmesg | grep blue
[ 25.483325] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0b05-180a.hcd failed with error -2
Here is the only closely matching firmware I see on the Arch site, and it doesn't look like the correct match:
Arch Linux - bluez-firmware 1.2-8 (any) https://www.archlinux.org/packages/extra/any/bluez-firmware/ Description: Firmwares for Broadcom BCM203x and STLC2300 Bluetooth chips
More info:
lsmod | grep btusb
btusb 40960 0
btrtl 16384 1 btusb
btbcm 16384 1 btusb
btintel 16384 1 btusb
bluetooth 495616 5 btrtl,btintel,btbcm,btusb
usbcore 212992 8 usbhid,usb_storage,ehci_hcd,xhci_pci,btusb,uas,xhci_hcd,ehci_pci
pacman -Qs blue*
local/bluedevil 1:5.11.5-1 (plasma)
Integrate the Bluetooth technology within KDE workspace and applications
local/bluez 5.48-1
Daemons for the bluetooth protocol stack
local/bluez-libs 5.48-1
Deprecated libraries for the bluetooth protocol stack
local/bluez-qt 5.42.0-1 (kf5)
Qt wrapper for Bluez 5 DBus API
local/bluez-utils 5.48-1
Development and debugging utilities for the bluetooth protocol stack
local/libbluray 1.0.1-1
Library to access Blu-Ray disks for video playback
local/sbc 1.3-1
Bluetooth Subband Codec (SBC) library
ls -la /lib/firmware/brcm
total 14396
drwxr-xr-x 1 root root 1340 Dec 9 21:15 .
drwxr-xr-x 1 root root 8630 Dec 9 21:15 ..
-rw-r--r-- 1 root root 269595 Dec 6 20:24 bcm4329-fullmac-4.bin
-rw-r--r-- 1 root root 96224 Dec 6 20:24 bcm43xx-0.fw
-rw-r--r-- 1 root root 180 Dec 6 20:24 bcm43xx_hdr-0.fw
-rw-r--r-- 1 root root 397312 Dec 6 20:24 brcmfmac43143.bin
-rw-r--r-- 1 root root 385067 Dec 6 20:24 brcmfmac43143-sdio.bin
-rw-r--r-- 1 root root 348160 Dec 6 20:24 brcmfmac43236b.bin
-rw-r--r-- 1 root root 455745 Dec 6 20:24 brcmfmac43241b0-sdio.bin
-rw-r--r-- 1 root root 403855 Dec 6 20:24 brcmfmac43241b4-sdio.bin
-rw-r--r-- 1 root root 408682 Dec 6 20:24 brcmfmac43241b5-sdio.bin
-rw-r--r-- 1 root root 479232 Dec 6 20:24 brcmfmac43242a.bin
-rw-r--r-- 1 root root 253748 Dec 6 20:24 brcmfmac4329-sdio.bin
-rw-r--r-- 1 root root 222126 Dec 6 20:24 brcmfmac4330-sdio.bin
-rw-r--r-- 1 root root 402210 Dec 6 20:24 brcmfmac43340-sdio.bin
-rw-r--r-- 1 root root 451566 Dec 6 20:24 brcmfmac4334-sdio.bin
-rw-r--r-- 1 root root 569291 Dec 6 20:24 brcmfmac4335-sdio.bin
-rw-r--r-- 1 root root 219557 Dec 6 20:24 brcmfmac43362-sdio.bin
-rw-r--r-- 1 root root 562183 Dec 6 20:24 brcmfmac4339-sdio.bin
-rw-r--r-- 1 root root 382455 Dec 6 20:24 brcmfmac43430a0-sdio.bin
-rw-r--r-- 1 root root 369577 Dec 6 20:24 brcmfmac43430-sdio.bin
-rw-r--r-- 1 root root 488193 Dec 6 20:24 brcmfmac43455-sdio.bin
-rw-r--r-- 1 root root 623304 Dec 6 20:24 brcmfmac4350c2-pcie.bin
-rw-r--r-- 1 root root 626140 Dec 6 20:24 brcmfmac4350-pcie.bin
-rw-r--r-- 1 root root 626589 Dec 6 20:24 brcmfmac4354-sdio.bin
-rw-r--r-- 1 root root 557056 Dec 6 20:24 brcmfmac43569.bin
-rw-r--r-- 1 root root 661999 Dec 6 20:24 brcmfmac4356-pcie.bin
-rw-r--r-- 1 root root 526383 Dec 6 20:24 brcmfmac4356-sdio.bin
-rw-r--r-- 1 root root 550333 Dec 6 20:24 brcmfmac43570-pcie.bin
-rw-r--r-- 1 root root 633817 Dec 6 20:24 brcmfmac4358-pcie.bin
-rw-r--r-- 1 root root 595472 Dec 6 20:24 brcmfmac43602-pcie.ap.bin
-rw-r--r-- 1 root root 635449 Dec 6 20:24 brcmfmac43602-pcie.bin
-rw-r--r-- 1 root root 989401 Dec 6 20:24 brcmfmac4366b-pcie.bin
-rw-r--r-- 1 root root 623448 Dec 6 20:24 brcmfmac4371-pcie.bin
The solution listed here sounded like it might work, but it did not. After trying it, the firmware is listed in the above directory:
-rw-r----- 1 root root 35127 Feb 5 01:26 BCM20702A1-13d3-3404.hcd
UPDATE: I found bcm20702a1-firmware in the Arch AUR here. After removing the manually installed file above, I installed the AUR package (no errors). After rebooting the issue is still not resolved.
The above directory now includes all these files:
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-0489-e032.hcd
-rw-r--r-- 1 root root 34904 Feb 5 01:39 BCM20702A1-0489-e042.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-0489-e046.hcd
-rw-r--r-- 1 root root 29101 Feb 5 01:39 BCM20702A1-0489-e047.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-0489-e04f.hcd
-rw-r--r-- 1 root root 35029 Feb 5 01:39 BCM20702A1-0489-e052.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-0489-e059.hcd
-rw-r--r-- 1 root root 35175 Feb 5 01:39 BCM20702A1-0489-e07a.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-0489-e087.hcd
-rw-r--r-- 1 root root 34904 Feb 5 01:39 BCM20702A1-04ca-2003.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-04ca-2004.hcd
-rw-r--r-- 1 root root 35108 Feb 5 01:39 BCM20702A1-04ca-2005.hcd
-rw-r--r-- 1 root root 35127 Feb 5 01:39 BCM20702A1-04ca-200a.hcd
-rw-r--r-- 1 root root 35127 Feb 5 01:39 BCM20702A1-04ca-200b.hcd
-rw-r--r-- 1 root root 35127 Feb 5 01:39 BCM20702A1-04ca-200c.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-04ca-200e.hcd
-rw-r--r-- 1 root root 35128 Feb 5 01:39 BCM20702A1-04ca-200f.hcd
-rw-r--r-- 1 root root 35000 Feb 5 01:39 BCM20702A1-050d-065a.hcd
-rw-r--r-- 1 root root 35027 Feb 5 01:39 BCM20702A1-0930-021e.hcd
-rw-r--r-- 1 root root 35220 Feb 5 01:39 BCM20702A1-0930-0221.hcd
-rw-r--r-- 1 root root 35175 Feb 5 01:39 BCM20702A1-0930-0223.hcd
-rw-r--r-- 1 root root 35061 Feb 5 01:39 BCM20702A1-0a5c-2169.hcd
-rw-r--r-- 1 root root 35186 Feb 5 01:39 BCM20702A1-0a5c-216b.hcd
-rw-r--r-- 1 root root 35080 Feb 5 01:39 BCM20702A1-0a5c-216f.hcd
-rw-r--r-- 1 root root 35127 Feb 5 01:39 BCM20702A1-0a5c-21de.hcd
-rw-r--r-- 1 root root 34997 Feb 5 01:39 BCM20702A1-0a5c-21e1.hcd
-rw-r--r-- 1 root root 35156 Feb 5 01:39 BCM20702A1-0a5c-21e3.hcd
-rw-r--r-- 1 root root 35042 Feb 5 01:39 BCM20702A1-0a5c-21e6.hcd
-rw-r--r-- 1 root root 35075 Feb 5 01:39 BCM20702A1-0a5c-21e8.hcd
-rw-r--r-- 1 root root 34934 Feb 5 01:39 BCM20702A1-0a5c-21ec.hcd
-rw-r--r-- 1 root root 35201 Feb 5 01:39 BCM20702A1-0a5c-21f1.hcd
-rw-r--r-- 1 root root 35201 Feb 5 01:39 BCM20702A1-0a5c-21f3.hcd
-rw-r--r-- 1 root root 35156 Feb 5 01:39 BCM20702A1-0a5c-21f4.hcd
-rw-r--r-- 1 root root 35218 Feb 5 01:39 BCM20702A1-0a5c-21fb.hcd
-rw-r--r-- 1 root root 35082 Feb 5 01:39 BCM20702A1-0a5c-21fd.hcd
-rw-r--r-- 1 root root 35156 Feb 5 01:39 BCM20702A1-0a5c-640b.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-0b05-17b5.hcd
-rw-r--r-- 1 root root 35000 Feb 5 01:39 BCM20702A1-0b05-17cb.hcd
-rw-r--r-- 1 root root 35127 Feb 5 01:39 BCM20702A1-0b05-17cf.hcd
-rw-r--r-- 1 root root 35077 Feb 5 01:39 BCM20702A1-0b05-180a.hcd
-rw-r--r-- 1 root root 35063 Feb 5 01:39 BCM20702A1-105b-e066.hcd
-rw-r--r-- 1 root root 34906 Feb 5 01:39 BCM20702A1-13d3-3384.hcd
-rw-r--r-- 1 root root 35108 Feb 5 01:39 BCM20702A1-13d3-3392.hcd
-rw-r--r-- 1 root root 35127 Feb 5 01:39 BCM20702A1-13d3-3404.hcd
-rw-r--r-- 1 root root 35148 Feb 5 01:39 BCM20702A1-13d3-3411.hcd
-rw-r--r-- 1 root root 35082 Feb 5 01:39 BCM20702A1-13d3-3413.hcd
-rw-r--r-- 1 root root 35082 Feb 5 01:39 BCM20702A1-13d3-3418.hcd
-rw-r--r-- 1 root root 35122 Feb 5 01:39 BCM20702A1-13d3-3435.hcd
-rw-r--r-- 1 root root 35122 Feb 5 01:39 BCM20702A1-13d3-3456.hcd
-rw-r--r-- 1 root root 34954 Feb 5 01:39 BCM20702A1-145f-01a3.hcd
-rw-r--r-- 1 root root 35125 Feb 5 01:39 BCM20702A1-413c-8143.hcd
-rw-r--r-- 1 root root 35055 Feb 5 01:39 BCM20702A1-413c-8197.hcd
Note that BCM20702A1-0b05-180a.hcd exactly matches the hardware listed in my error message, so one would expect this to have solved the issue. It did not. However, the logs look better, so maybe this was one step toward a solution:
dmesg | grep -i blue
[ 11.263011] Bluetooth: Core ver 2.22
[ 11.263032] Bluetooth: HCI device and connection manager initialized
[ 11.263035] Bluetooth: HCI socket layer initialized
[ 11.263037] Bluetooth: L2CAP socket layer initialized
[ 11.263041] Bluetooth: SCO socket layer initialized
[ 11.411884] Bluetooth: hci0: BCM: chip id 63
[ 11.412884] Bluetooth: hci0: BCM: features 0x07
[ 11.428908] Bluetooth: hci0: BCM20702A
[ 11.429897] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[ 12.190957] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1714
[ 12.206954] Bluetooth: hci0: Bluetooth USB module
Update 2: after the last step, one more simple step solved the issue:
systemctl start bluetooth.service
systemctl enable bluetooth.service
I'll write up an answer based on this.