Tvheadend

On QNAP QTS 4.5 the 2x TV Butler DVB-C sticks (quivalent to Logilink VG0022A using firmware dvb-usb-it9303-01.fw) are recognized (manufacturer Dexatek Technology Ltd)

uname -a
Linux NAS-TVS-472XT 4.14.24-qnap #4 SMP Fri Jan 28 07:31:12 CST 2022 x86_64 GNU/Linux

lsusb
Bus 001 Device 006: ID 1d19:0100 Dexatek Technology Ltd.
Bus 001 Device 005: ID 1d19:0100 Dexatek Technology Ltd.
Bus 001 Device 002: ID 1005:b155 Apacer Technology, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

dmesg
...
[  957.456793] usb 1-4: USB disconnect, device number 3
[  957.483571] [usb.001.003] /sys/devices/pci0000:00/0000:00:14.0/usb1/1-4 removed.
[  959.822043] usb 1-6: USB disconnect, device number 4
[  959.850480] [usb.001.004] /sys/devices/pci0000:00/0000:00:14.0/usb1/1-6 removed.
[  971.989620] usb 1-6: new high-speed USB device number 5 using xhci_hcd
[  972.143249] [usb.001.005] /sys/devices/pci0000:00/0000:00:14.0/usb1/1-6 added.
[  973.839680] usb 1-4: new high-speed USB device number 6 using xhci_hcd
[  973.991997] [usb.001.006] /sys/devices/pci0000:00/0000:00:14.0/usb1/1-4 added.

cat /sys/bus/usb/devices/1-4/product
TS Aggregator

TVMosaic qnap app recognizes the sticks as tv adapters (but DVBLogic went out of business) therefore I assume drivers are loaded successfully

Hovever, /dev/dvb does not exist and therefore TVHeadend doesn't recognize them as DVB-C adapters.

I tried to rebuild /dv/dvb manually according to this (http://www.roland-gersch.de/dec2000/node6.html)

rm -rf /dev/dvb

mkdir /dev/dvb
chmod 755 /dev/dvb

for i in `seq 0 3`; do
        echo "Creating DVB devices in /dev/dvb/adapter$i" 
        mkdir /dev/dvb/adapter$i
        chmod 755 /dev/dvb/adapter$i
        mknod -m 0660 /dev/dvb/adapter$i/video0    c 250   `expr 64 \* $i + 0`
        mknod -m 0660 /dev/dvb/adapter$i/audio0    c 250   `expr 64 \* $i + 1`
        mknod -m 0660 /dev/dvb/adapter$i/frontend0 c 250   `expr 64 \* $i + 3`
        mknod -m 0660 /dev/dvb/adapter$i/demux0    c 250   `expr 64 \* $i + 4`
        mknod -m 0660 /dev/dvb/adapter$i/dvr0      c 250   `expr 64 \* $i + 5`
        mknod -m 0660 /dev/dvb/adapter$i/ca0       c 250   `expr 64 \* $i + 6`
        mknod -m 0660 /dev/dvb/adapter$i/net0      c 250   `expr 64 \* $i + 7`
        mknod -m 0660 /dev/dvb/adapter$i/osd0      c 250   `expr 64 \* $i + 8`
        chown admin /dev/dvb/adapter$i/*
done

cat /dev/dvb/adapter0/dvr0
cat: /dev/dvb/adapter0/dvr0: No such device or address

cat /dev/dvb/adapter0/frontend0: No such device or address

However there is no such device in frontend0 and dvr0 and the structue is removed on next reboot

Is there any way to use the dvb-c usb sticks with TVHeadend?

Thank you very much for your help!