I've been having all sorts of weird issues getting bluetooth to work in Arch. My card is the Ralink RT3290 Wireless 802.11n 1T/1R PCIe which is both a WiFi and Bluetooth controller.
Found this on the Arch AUR site (https://aur.archlinux.org/packages/rtbth-dkms/?comments=all) and I knew I was on the right track because the author mentioned his machine would freeze when rmmod the bluetooth driver which is a symptom I also had.
By the way, you also need to have installed the rtbth-dkms package from the AUR (and linux-headers). And finally, afterwards I couldn't get high quality sound (A2DP) to work until I unpaired and re-paired my head phones....WHEW.
And oh yeah, everytime I shutdown I get a "watchdog didn't stop" and after a minute or so of waiting I have to hard power off. Still looking into that, but didn't happen before all this.
1. blacklist the module to Prevent it from load on boot:
#echo "blacklist rtbth" > /etc/modprobe.d/ralink-bt.conf
2. Local script, / usr / local / sbin / rtbth, to load and start rtbt tool:
#!/bin/bash
sleep 5
/sbin/modprobe --ignore-install rtbth; /usr/bin/mknod /dev/rtbth c 192 0; /usr/bin/rtbt &
3. systemctl service, the /etc/systemd/system/rtbth.service file:
[Unit]
Description = Fix rtbth bluetooth after gmd start
After = display-manager.service
[Service]
Type = oneshot
ExecStart =/usr/local/sbin/rtbth
TimeoutSec = 0
RemainAfterExit = true
[Install]
WantedBy = multi-user.target
4. enable it to start on boot:
#systemctl enable rtbth
