Troubleshooting • scanning bluetooth PHY CODED via external usb dongle

Dear all,

I am facing a problem with external usb bluetooth hci controller.

I created a usb dongle supporting bluetooth 5 via flashing Nordic hci usb firmware to nrf52840 and I want to scan devices with bluetooth Low Energy PHY Coded.

in btmgmt it clearly says via command: phy
That PHY is supported and activated on this devices
Everything looks detected and working upon starting scanning

Whenever I issue command: scan on in bluetoothctl utility
it yields: SetDiscoverFilter success
failed to start discovery: org.bluez.Error.InProgress

and when trying to start scanning via btmgmt command: find
It yields: Unable to start discovery. status 0x0c (Not Supported)

The dongle works very fine even on old Debian 12, it happily scans for devices advertising on PHY CODED, so why the same dongle does not work on up to day Raspberry Pi OS on Raspberry Pi 4?

I even issued overlay to disable internal bluetooth controller just to be sure that the scanning process is not mangled by it, but no success

Could anyone help me?
Thanks

Statistics: Posted by ihora — Sat Jan 17, 2026 8:22 pm

---