View Full Version : AF9015 usb tv tunner stops locking channel after a while

January 4th, 2011, 02:52 PM
Hi All,

I have a usb tunner which works great except for the fact that after a couple of hours it stops locking the channels.

I know is not low signal problem because mythtv shows there is 87% signal.

The problem is solved by disconnecting the tunner, restarting the pc, then connecting the tunner again.

I have noticed that when the tunner works on /var/log/messages I have this line every 4 minutes:

Jan 2 01:34:40 MediaCenter kernel: [ 1125.279303] af9015_pid_filter_ctrl: onoff:0

..and when it stops working I dont get that line anymore

Any leads?

January 6th, 2011, 09:31 PM

January 9th, 2011, 10:14 PM

January 12th, 2011, 02:47 AM
Ah, good to know I'm not the only one having this problem. Unfortunately, I don't know how to fix this. At best, it's sufficient to unplug/re-plug the tuner in my case, maybe unload the modules. I've never had to reboot the machine. This however, was mostly on Kubuntu Karmic and Debian squeeze. I've migrated the Karmic to Maverick and haven't got around to testing it yet, and also migrated the Squeeze machine to Natty, where the tuner works OotB. The Natty machine seems not to have this problem, but I have yet to test it thoroughly.

Oh yeah - which version of the firmware are you using?

January 30th, 2011, 09:53 PM
True...no need to restart the machine..I have to restart myth-tv tough

by fm do you mean what is the module? dvb-usb-af9015

January 31st, 2011, 01:26 AM
by fm do you mean what is the module? dvb-usb-af9015
If you meant to ask about the firmware version, that is displayed in kernel messages when you insert the tuner:

[181803.432142] usb 1-1: new high speed USB device using ehci_hcd and address 7
[181803.936544] dvb-usb: found a 'Afatech AF9015 DVB-T USB2.0 stick' in cold state, will try to load a firmware
[181803.963534] dvb-usb: downloading firmware from file 'dvb-usb-af9015.fw'
[181804.033699] dvb-usb: found a 'Afatech AF9015 DVB-T USB2.0 stick' in warm state.
[181804.033948] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[181804.034847] DVB: registering new adapter (Afatech AF9015 DVB-T USB2.0 stick)
[181804.047783] af9013: firmware version:

On a separate note, the issue seems to have been fixed in natty's 2.6.37-12 (possibly earlier) kernel. I switched to 2.6.38-1 but that seems to bring up more issues than it solves.

January 31st, 2011, 09:59 PM
Exactly the same behavior with my Kworld 399U dual DVB-T usb 2.0 with AF9015 and Muthbuntu 10.10 amd 64.

Hopefully with natty final kernel problem is fixed.

June 24th, 2011, 02:51 PM
Any word on how well the chipset works with the natty kernel?

June 25th, 2011, 05:38 PM
Any word on how well the chipset works with the natty kernel?

Works for me OotB.