[tvjon]

...If nothing else, someone might stumble in here one day with a similar problem!

(And I didn't know that the 290e had a DVB-C frontend... mine hasn't... or, at least, not one that's ever been enabled... but I don't have cable anyway, so I'm not missing anything of use to me).

Hello. I've stumbled in as I still haven't found a fix. I reported the demodulator problem on Github several weeks ago, but specifically wrt Raspberry-Pi, as that's my main goal for the 290e.

Here's my dmesg:

[ 3910.121078] em28xx: New device PCTV Systems PCTV 290e @ 480 Mbps (2013:024f, interface 0, class 0)
[ 3910.121110] em28xx: DVB interface 0 found: isoc
[ 3910.121498] em28xx: chip ID is em28174
[ 3910.469350] em28174 #0: i2c eeprom 0000: 26 00 01 00 02 09 d8 85 80 80 e5 80 f4 f5 94 90
[ 3910.469411] em28174 #0: i2c eeprom 0010: 78 0d e4 f0 f5 46 12 00 5a c2 eb c2 e8 30 e9 03
[ 3910.469486] em28174 #0: i2c eeprom 0020: 12 09 de 30 eb 03 12 09 10 30 ec f1 12 07 72 80
[ 3910.469528] em28174 #0: i2c eeprom 0030: ec 00 60 00 e5 f5 64 01 60 09 e5 f5 64 09 60 03
[ 3910.469570] em28174 #0: i2c eeprom 0040: c2 c6 22 e5 f7 b4 03 13 e5 f6 b4 87 03 02 09 92
[ 3910.469610] em28174 #0: i2c eeprom 0050: e5 f6 b4 93 03 02 07 e6 c2 c6 22 c2 c6 22 12 09
[ 3910.469650] em28174 #0: i2c eeprom 0060: cf 02 06 19 1a eb 67 95 13 20 4f 02 c0 13 6b 10
[ 3910.469691] em28174 #0: i2c eeprom 0070: a0 1a ba 14 ce 1a 39 57 00 5c 18 00 00 00 00 00
[ 3910.469730] em28174 #0: i2c eeprom 0080: 00 00 00 00 44 36 00 00 f0 10 02 00 00 00 00 00
[ 3910.469769] em28174 #0: i2c eeprom 0090: 5b 23 c0 00 00 00 20 40 20 80 02 20 01 01 00 00
[ 3910.469809] em28174 #0: i2c eeprom 00a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 3910.469849] em28174 #0: i2c eeprom 00b0: c6 40 00 00 00 00 a7 00 00 00 00 00 00 00 00 00
[ 3910.469887] em28174 #0: i2c eeprom 00c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 38 32
[ 3910.469929] em28174 #0: i2c eeprom 00d0: 34 31 30 31 31 36 36 30 31 37 31 33 31 31 59 5a
[ 3910.469970] em28174 #0: i2c eeprom 00e0: 43 37 00 4f 53 49 30 30 33 30 38 44 30 31 31 30
[ 3910.470010] em28174 #0: i2c eeprom 00f0: 59 5a 43 37 00 00 00 00 00 00 00 00 00 00 31 30
[ 3910.470052] em28174 #0: i2c eeprom 0100: ... (skipped)
[ 3910.470078] em28174 #0: EEPROM ID = 26 00 01 00, EEPROM hash = 0x39b824ad
[ 3910.470089] em28174 #0: EEPROM info:
[ 3910.470101] em28174 #0: microcode start address = 0x0004, boot configuration = 0x01
[ 3910.499850] em28174 #0: No audio on board.
[ 3910.499886] em28174 #0: 500mA max power
[ 3910.499904] em28174 #0: Table at offset 0x39, strings=0x1aa0, 0x14ba, 0x1ace
[ 3910.500206] em28174 #0: Identified as PCTV nanoStick T2 290e (card=78)
[ 3910.500240] em28174 #0: v4l2 driver version 0.2.0
[ 3910.512528] em28174 #0: V4L2 video device registered as video0
[ 3910.512566] em28174 #0: dvb set to isoc mode.
[ 3910.529568] gpiochip_find_base: cannot find free range
[ 3910.529608] gpiochip_add: gpios -1..1 (cxd2820r) failed to register
[ 3910.529659] em28174 #0: /2: frontend initialization failed
[ 3910.530623] Registered IR keymap rc-pinnacle-pctv-hd
[ 3910.531316] input: em28xx IR (em28174 #0) as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3.1/rc/rc1/input4
[ 3910.531938] rc1: em28xx IR (em28174 #0) as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3.1/rc/rc1

So, no frontend /dev tree generated since about kernel 3.10.25

The RPi has several improvements with later kernels so it's a pain to revert to an old one.