Thanks for the hint. This made a change, but it’s not enough. The LED on the tuner is now lit, so it at least gets power, but dmesg reports:
[162655.745812] usb 1-2: new high-speed USB device number 9 using xhci-hcd
[162655.886338] usb 1-2: New USB device found, idVendor=2040, idProduct=8265
[162655.886351] usb 1-2: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[162655.886356] usb 1-2: Product: dualHD
[162655.886361] usb 1-2: Manufacturer: HCW
[162655.886365] usb 1-2: SerialNumber: 0014105122
[162655.888007] em28xx 1-2:1.0: New device HCW dualHD @ 480 Mbps (2040:8265, interface 0, class 0)
[162655.888019] em28xx 1-2:1.0: DVB interface 0 found: bulk
[162655.888415] em28xx 1-2:1.0: chip ID is em28174
[162656.025835] em28xx 1-2:1.0: failed to read eeprom (err=-110)
[162656.025850] em28xx 1-2:1.0: em28xx_i2c_register: em28xx_i2_eeprom failed! retval [-110]
[162656.025857] em28xx 1-2:1.0: em28xx_init_dev: em28xx_i2c_register bus 0 - error [-110]!
[162656.025884] em28xx: probe of 1-2:1.0 failed with error -110
I am afraid a newer driver will be needed.