Need help enabling Bluetooth / Wifi USB device

Hi Guys,

I have a Intel NUC of the seventh generation (Intel NUC Kit NUC7i5BNK to be precise) and modified it so it rests in an Akasa fanlles case (product.detail.tpl&no=181&type=fanless chassis&type_sub=fanless nuc&model=a-nuc37-a1b).

Due to this modification my on-board bluetooth doesn't work properly anymore becuase of weak signal. So I bought a cheap Wifi/Bluetooth combination stick from Aliexpress. The following one: Comfast Wireless 600Mbps USB WiFi Receiver Adapter 5DB Antenna Bluetooth 4.2 WiFi for Windows 7 8 10 XP System Computers Laptops-in Network Cards from Computer & Office on Aliexpress.com | Alibaba Group

When booting to Libreelec the system won't start properly, I only see a cursor on my screen. As soon as I unplug the USB device the system continues to boot and all works fine, so I don't even have to reboot. Unfortunatly when I the plug in the device again it doesn't recognise any wifi nor bluetooth device (I have disabled both onboard wifi and bluetooth).

If I enter lsusb over ssh I see it is a realtek device. Is this particular chipset supported?

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Bus 001 Device 004: ID 03eb:2ffa Atmel Corp. at90usb162 DFU bootloader

Bus 001 Device 003: ID 0413:0308 Leadtek Research, Inc.

Bus 001 Device 005: ID 0bda:1a2b Realtek Semiconductor Corp. <----------------------------- My device

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Can somebody help me debug more or even knows how to get this device working? Can I compile drivers myself? I found the following instructions on Github: GitHub - yklove/rtl8821cu it should do the trick?

Any help is much appreciated. If you need more info. Please let me know.

Kind regards,

Chris

Some more info:

dmesg output and lsmod output:

Okay, got a little bit further. I read in an other thread these devices sometimes automagically mount as a storage devices so it can install the windows drivers.

After installing Libreelec system tools with usb_modeswitch and running: usb_modeswitch -KW -v 0bda -p 1a2b at least my usb device seems recognized in LE. Will test further and report back for success or failure

All is good, everything working. Hope my findings might work for somebody to get a Realtek rtl8821cu chipset working on LibreElec 9 and above.

Ok, I was a bit to fast yesterday. Not all is good

I now have the following problem: when rebooting or powering up with the bluetooth device already inserted, it is not recognized in LE. So I have to manually pull out the USB bluetooth adapter > re-insert the USB bluetooth adapter > run usb_modeswitch -KW -v 0bda -p 1a2b command.

If I don't pull out and re-insert the adapter the usb_modeswitch command doesn't work When looking at dmesg it looks like the bluetooth adapter is initialized correctly but LE doesn't show any bluetooth adapters. See output of demsg | grep "blue":

[ 3.495940] Bluetooth: Core ver 2.22

[ 3.495954] Bluetooth: HCI device and connection manager initialized

[ 3.495958] Bluetooth: HCI socket layer initialized

[ 3.495960] Bluetooth: L2CAP socket layer initialized

[ 3.495965] Bluetooth: SCO socket layer initialized

[ 3.500721] Bluetooth: hci0: RTL: rtl: examining hci_ver=08 hci_rev=826c lmp_ver=08 lmp_subver=a99e

[ 3.500723] Bluetooth: hci0: RTL: rtl: unknown IC info, lmp subver a99e, hci rev 826c, hci ver 0008

[ 3.524389] Bluetooth: BNEP (Ethernet Emulation) ver 1.3

[ 3.524390] Bluetooth: BNEP filters: protocol multicast

[ 3.524393] Bluetooth: BNEP socket layer initialized

So, how to automate this? I think I should have a script that unmounts/ejects my USB bluetooth device, then remounts the device and run usb_modeswitch command. Trying to found out how to unmount. Anybody willing to help and give some advice on how to tackle this?

Any help is much appreciated

I think I need to add some script to autostart.sh to unmount the USB bluetooth device but the commnad lsblk isn't working. How to know where my device is mounted?