Hi,

Same problem here, on Kaffeine the channel scan shows signal and SNR but doesn't find any channels. The card is Pinnacle PCTV 310i, and has been working fine till Karmic. Below's the output of dmesg and lspci for if it's of any help:

(sudo lspci -v, just the controller data):
01:07.0 Multimedia controller: Philips Semiconductors SAA7131/SAA7133/SAA7135 Video Broadcast Decoder (rev d0)
	Subsystem: Pinnacle Systems Inc. Device 002f
	Flags: bus master, medium devsel, latency 32, IRQ 19
	Memory at fdeff000 (32-bit, non-prefetchable) [size=2K]
	Capabilities: [40] Power Management version 2
	Kernel driver in use: saa7134
	Kernel modules: saa7134

(dmesg, only relevant parts):
[   48.537930] Linux video capture interface: v2.00
[   48.587494] saa7130/34: v4l2 driver version 0.2.15 loaded
[   48.601644] saa7134 0000:01:07.0: PCI INT A -> Link[APC4] -> GSI 19 (level, low) -> IRQ 19
[   48.601650] saa7133[0]: found at 0000:01:07.0, rev: 208, irq: 19, latency: 32, mmio: 0xfdeff000
[   48.601656] saa7133[0]: subsystem: 11bd:002f, board: Pinnacle PCTV 310i [card=101,autodetected]
[   48.601671] saa7133[0]: board init: gpio is 604c000
[   48.601678] IRQ 19/saa7133[0]: IRQF_DISABLED is not guaranteed on shared IRQs
[   48.780029] saa7133[0]: i2c eeprom 00: bd 11 2f 00 54 20 1c 00 43 43 a9 1c 55 d2 b2 92
[   48.780038] saa7133[0]: i2c eeprom 10: ff e0 60 06 ff 20 ff ff 00 30 8d 2c 01 18 ff ff
[   48.780045] saa7133[0]: i2c eeprom 20: 01 2c 01 03 03 01 04 31 98 ff 00 a8 ff 21 00 c2
[   48.780052] saa7133[0]: i2c eeprom 30: 96 10 03 32 15 20 ff ff 0c 22 17 77 03 17 ef 50
[   48.780059] saa7133[0]: i2c eeprom 40: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780066] saa7133[0]: i2c eeprom 50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780073] saa7133[0]: i2c eeprom 60: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780080] saa7133[0]: i2c eeprom 70: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780087] saa7133[0]: i2c eeprom 80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780094] saa7133[0]: i2c eeprom 90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780100] saa7133[0]: i2c eeprom a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780107] saa7133[0]: i2c eeprom b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780114] saa7133[0]: i2c eeprom c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780121] saa7133[0]: i2c eeprom d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780128] saa7133[0]: i2c eeprom e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780135] saa7133[0]: i2c eeprom f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   48.780144] i2c-adapter i2c-2: Invalid 7-bit address 0x7a
[   48.900130] tuner 2-004b: chip found @ 0x96 (saa7133[0])
[   49.070029] tda829x 2-004b: setting tuner address to 61
[   49.200046] tda829x 2-004b: type set to tda8290+75a
[   54.842894] input: i2c IR (Pinnacle PCTV) as /devices/virtual/input/input5
[   54.842931] ir-kbd-i2c: i2c IR (Pinnacle PCTV) detected at i2c-2/2-0047/ir0 [saa7133[0]]
[   54.970085] saa7133[0]: registered device video0 [v4l2]
[   54.970108] saa7133[0]: registered device vbi0
[   54.970130] saa7133[0]: registered device radio0
[   54.974926] saa7134 ALSA driver for DMA sound loaded
[   54.974939] IRQ 19/saa7133[0]: IRQF_DISABLED is not guaranteed on shared IRQs
[   54.974961] saa7133[0]/alsa: saa7133[0] at 0xfdeff000 irq 19 registered as card -2
[   55.007803] dvb_init() allocating 1 frontend
[   55.030129] DVB: registering new adapter (saa7133[0])
[   55.030134] DVB: registering adapter 0 frontend 0 (Philips TDA10046H DVB-T)...
[   55.200019] tda1004x: setting up plls for 48MHz sampling clock
[   57.640017] tda1004x: timeout waiting for DSP ready
[   57.740034] tda1004x: found firmware revision 0 -- invalid
[   57.740038] tda1004x: trying to boot from eeprom
[   60.110015] tda1004x: timeout waiting for DSP ready
[   60.230035] tda1004x: found firmware revision 0 -- invalid
[   60.230039] tda1004x: waiting for firmware upload...
[   60.230044] saa7134 0000:01:07.0: firmware: requesting dvb-fe-tda10046.fw
[   60.559360] saa7134 0000:01:07.0: firmware: requesting dvb-fe-tda10045.fw
[   60.563640] tda1004x: no firmware upload (timeout or file not found?)
[   60.563680] tda1004x: firmware upload failed

Regards,

Tuukka