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Mám úplně stejný problém s USB tunerem LEADTEK WinFast DTV Dongle GOLD (také AF9015 + TDA18271).

Podle http://linuxtv.org/wiki/index.php/Leadtek_WinFast_DTV_Dongle_Gold je plně podporovaný od 2.6.28, zkoušel jsem jádra 3.2.12 a 3.3.4. Zkoušel jsem firmware 4.65, 4.95 a 5.1.0, přičemž jsem ale nezaznamenal žádný zásadní rozdíl

Firmware se korektně načte, tuner se zinicializuje a potom:

usb 1-1.2: new high-speed USB device number 11 using xhci_hcd
usb 1-1.2: New USB device found, idVendor=0413, idProduct=6029
usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1.2: Product: WinFast DTV Dongle Gold
usb 1-1.2: Manufacturer: Leadtek
usb 1-1.2: ep 0x81 - rounding interval to 32768 microframes, ep desc says 0 microframes
usb 1-1.2: ep 0x2 - rounding interval to 32768 microframes, ep desc says 0 microframes
usb 1-1.2: ep 0x84 - rounding interval to 32768 microframes, ep desc says 0 microframes
usb 1-1.2: ep 0x85 - rounding interval to 32768 microframes, ep desc says 0 microframes
dvb-usb: found a 'Leadtek WinFast DTV Dongle Gold' in cold state, will try to load a firmware
dvb-usb: downloading firmware from file 'dvb-usb-af9015.fw'
dvb-usb: found a 'Leadtek WinFast DTV Dongle Gold' in warm state.
dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
DVB: registering new adapter (Leadtek WinFast DTV Dongle Gold)
af9013: firmware version 4.95.0.0
DVB: registering adapter 0 frontend 0 (Afatech AF9013)...
tda18271 15-00c0: creating new instance
TDA18271HD/C2 detected @ 15-00c0
Registered IR keymap rc-leadtek-y04g0051
input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.4/0000:0d:00.0/usb1/1-1/1-1.2/rc/rc2/input15
rc2: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.4/0000:0d:00.0/usb1/1-1/1-1.2/rc/rc2
dvb-usb: schedule remote query interval to 500 msecs.
dvb-usb: Leadtek WinFast DTV Dongle Gold successfully initialized and connected.

Ovšem během skenování to začne haprovat

Apr 30 20:09:30 tvondra kernel: tda18271: performing RF tracking filter calibration
Apr 30 20:09:31 tvondra kernel: af9015: recv bulk message failed:-71
Apr 30 20:09:33 tvondra kernel: af9015: recv bulk message failed:-110
Apr 30 20:09:33 tvondra kernel: af9013: i2c rd failed=-1 reg=d417 len=1
Apr 30 20:09:33 tvondra kernel: tda18271_read_extended: [15-00c0|M] ERROR: i2c_transfer returned: -1
Apr 30 20:09:33 tvondra kernel: tda18271_powerscan: [15-00c0|M] error -1 on line 506
Apr 30 20:09:33 tvondra kernel: tda18271_rf_tracking_filters_init: [15-00c0|M] error -1 on line 601
Apr 30 20:09:33 tvondra kernel: tda18271_calc_rf_filter_curve: [15-00c0|M] error -1 on line 662
Apr 30 20:09:33 tvondra kernel: tda18271c2_rf_cal_init: [15-00c0|M] error -1 on line 687
Apr 30 20:09:33 tvondra kernel: tda18271: RF tracking filter calibration failed!
Apr 30 20:09:33 tvondra kernel: tda18271: performing RF tracking filter calibration
Apr 30 20:09:35 tvondra kernel: tda18271: RF tracking filter calibration complete

Nevím jestli je problém v driveru v jádře, ve firmware nebo kde.

dvbscan ani w_scan většinou nic nenajdou - zkoušel jsem dvě pasivní antény a jednu novou aktivní. Někdy se něco najde a dokonce se mi občas povedlo video zprovoznit v kaffeine. Ale je to nespolehlivé, občas to zamrzne, občas to začne kostičkovat nebo vypadne zvuk.