Looks like the em28xx driver is not automatically loading. If I load it manually with modprobe, I see the following in dmesg, which is looking promising:
[83407.347649] em28xx: New device PCTV PCTV 292e @ 480 Mbps (2013:025f, interface 0, class 0)
[83407.347660] em28xx: DVB interface 0 found: isoc
[83407.347753] em28xx: chip ID is em28178
[83409.336946] em28178 #0: EEPROM ID = 26 00 01 00, EEPROM hash = 0xa413f604
[83409.336953] em28178 #0: EEPROM info:
[83409.336956] em28178 #0: microcode start address = 0x0004, boot configuration = 0x01
[83409.342920] em28178 #0: AC97 audio (5 sample rates)
[83409.342924] em28178 #0: 500mA max power
[83409.342929] em28178 #0: Table at offset 0x27, strings=0x146a, 0x1888, 0x0a7e
[83409.343018] em28178 #0: Identified as PCTV tripleStick (292e) (card=94)
[83409.343023] em28178 #0: dvb set to isoc mode.
[83409.343068] usbcore: registered new interface driver em28xx
Not sure why this driver doesn’t load automatically. I also don’t see any obvious dvb device in /dev/, so more to investigate…