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Useful Commands

bluetoothctl devices

sudo systemctl enable bluetooth.service
sudo systemctl start bluetooth.service

sudo bluetoothctl
power on
agent on
default-agent
pairable on
discoverable on
scan on

In the following, replace XXXXX:XXXXX:XXXXX:XXXXX with the device MAC address.

trust XXXXX:XXXXX:XXXXX:XXXXX
pair XXXXX:XXXXX:XXXXX:XXXXX
connect XXXXX:XXXXX:XXXXX:XXXXX

Make sure the default agent is the actual device. For instance, if you have an extender, plug and unplug to see changes in lsusb | grep -i bluetooth.

General Troubleshooting

Ensure in Bluetooth User Group:

sudo usermod -aG bluetooth $USER
sudo systemctl enable bluetooth

Find Device ID

Use find /sys/bus/usb/devices/ -name "power" -exec grep -H . {} \; | grep auto or usb-devices | grep -A 20 -i bluetooth or

cd /sys/bus/usb/devices
for dev in 1-*; do echo "$dev"; grep -q 8087 $dev/idVendor 2>/dev/null && grep -q 0033 $dev/idProduct 2>/dev/null && echo "Match: $dev"; done

to find device path. Replace 1-14 from now on where needed with the right one.

Check Power Suspend

Ensure

[Policy]

AutoEnable=true IdleTimeout=0

and

[General]

UserspaceHID=true IdleTimeout=0

are in /etc/bluetooth/input.conf (cat /etc/bluetooth/input.conf).

Confirm power management off:

sudo iwconfig wlo1 power off
sudo systemctl stop bluetooth
sudo systemctl start bluetooth

cat /sys/bus/usb/devices/*/power/control | grep auto

Make sure there aren't power timeouts.

cat /sys/bus/usb/devices/1-14/power/control

Try echo on | sudo tee /sys/bus/usb/devices/1-14/power/control to disable autosuspend temporarily (Use echo auto | sudo tee /sys/bus/usb/devices/1-14/power/control to turn back on if desired.) Replace 1-14 with your actual device path (see elsewhere in this document for how to find it).

Add to /etc/default/grub's GRUB_CMDLINE_LINUX_DEFAULT options: btusb.enable_autosuspend=n (separate from other options after the colon with a space).

Example /etc/bluetooth/input.conf

# Configuration file for the input service

# This section contains options which are not specific to any
# particular interface
[General]

# Set idle timeout (in minutes) before the connection will
# be disconnect (defaults to 0 for no timeout)
IdleTimeout=0

[Policy]
IdleTimeout=0  # for mx mouse
UserspaceHID=true  # For mx mouse


# Enable HID protocol handling in userspace input profile
# Defaults to false (HIDP handled in HIDP kernel module)
#UserspaceHID=true

# Limit HID connections to bonded devices
# The HID Profile does not specify that devices must be bonded, however some
# platforms may want to make sure that input connections only come from bonded
# device connections. Several older mice have been known for not supporting
# pairing/encryption.
# Defaults to true for security.
#ClassicBondedOnly=true

# LE upgrade security
# Enables upgrades of security automatically if required.
# Defaults to true to maximize device compatibility.
#LEAutoSecurity=true