[linux-dvb] Nova-T 500 issues - losing one tuner

Jonas Anden jonas at anden.nu
Sun Feb 3 10:39:01 CET 2008


I have a hunch about this problem...

I had this problem (I tink 3 times last weekend) after initially
updating my hg tree and recompiling the modules. I then turned on full
debugging for the dib0700 module in order to try to see what happens
when it goes wrong, but with full debugging on I haven't been able to
reproduce the problem. I ran with full debugging on from monday to
saturday and *really* tried to make it go away. I tried starting all
tuners at once (ie scheduling three programs with the same start time),
I tried running long recordings, I tried running plenty of retuning, and
I tried doing it "my normal way" of a few recordings a day. Nothing made
the tuner die.

So yesterday, I finally gave up in trying to cause the problem. I turned
debugging back off, and this morning one of the tuners is dead again
(MythTV stopping at "L__" instead of proceeding to "LMS".)

The *ONLY* change I have made is changing the debugging setting.

This, in combination with the fact that some people see it and some
don't, leads me to believe that this is timer-induced. Something can't
keep up. Adding debugging makes the operations slightly slower (the
module needs to do additional IO to speak to syslogd), and this delay
seems to be enough to keep it operational.

I don't think this has anything to do with the remote since I have the
RC feature disabled (I'm using an M$ MCE remote instead).

I set it up with full debugging (options dvb_usb_0700 debug=15). This
will cause a whole bunch of logging in the system logs, but appears to
keep the tuner alive. I have now changed the debug setting to 1 (only
'info' type messages) to see if that also keeps the tuner alive.

My system has a 3.3 Ghz Celeron processor. Shaun, Ben, Nicolas -- what
kind of systems are you running? If my hunch is correct, I'd expect
Shaun and Ben to have faster processors than Nicolas since they are
seeing this issue and Nicolas isn't.

  // J

On Sat, 2008-02-02 at 10:20 +0000, Shaun wrote:
> On Friday 01 February 2008 21:43:51 Nicolas Will wrote:
> > On Fri, 2008-02-01 at 21:07 +0000, Ben Firshman wrote:
> > > Feb  1 20:52:04 mythtv kernel: [   11.072000] dvb-usb: found a
> > > 'Hauppauge Nova-T 500 Dual DVB-T' in cold state, will try to load a
> > > firmware Feb  1 20:52:04 mythtv kernel: [   11.132000] dvb-usb:
> > > downloading firmware from file 'dvb-usb-dib0700-1.10.fw'
> > > ...
> > > Feb  1 20:52:04 mythtv kernel: [   11.844000] dvb-usb: found a
> > > 'Hauppauge Nova-T 500 Dual DVB-T' in warm state.
> > > Feb  1 20:52:04 mythtv kernel: [   11.844000] dvb-usb: will pass the
> > > complete MPEG2 transport stream to the software demuxer.
> > > Feb  1 20:52:04 mythtv kernel: [   11.844000] DVB: registering new
> > > adapter (Hauppauge Nova-T 500 Dual DVB-T)
> > > Feb  1 20:52:04 mythtv kernel: [   11.956000] DVB: registering frontend
> > > 1 (DiBcom 3000MC/P)...
> > > ...
> > > Feb  1 20:52:04 mythtv kernel: [   12.500000] dvb-usb: will pass the
> > > complete MPEG2 transport stream to the software demuxer.
> > > Feb  1 20:52:04 mythtv kernel: [   12.500000] DVB: registering new
> > > adapter (Hauppauge Nova-T 500 Dual DVB-T)
> > > Feb  1 20:52:04 mythtv kernel: [   12.508000] DVB: registering frontend
> > > 2 (DiBcom 3000MC/P)...
> > > Feb  1 20:52:04 mythtv kernel: [   13.068000] input: IR-receiver inside
> > > an USB DVB receiver as /class/input/input2
> > > Feb  1 20:52:04 mythtv kernel: [   13.068000] dvb-usb: schedule remote
> > > query interval to 150 msecs.
> > > Feb  1 20:52:04 mythtv kernel: [   13.068000] dvb-usb: Hauppauge Nova-T
> > > 500 Dual DVB-T successfully initialized and connected.
> > >
> > > Got the tree from the day of your message, and I'm still having
> > > problems. I'm not the only one either:
> > >
> > > http://www.linuxtv.org/pipermail/linux-dvb/2008-January/022629.html
> > >
> > > Thanks
> > >
> > > Ben
> > >
> > > Nicolas Will wrote:
> > > > On Sun, 2008-01-27 at 14:30 +0000, Ben Firshman wrote:
> > > >> I am using the (almost) latest SVN version of mythtv. I am using the
> > > >> v4l-dvb sources from a couple of days back. I have followed and used
> > > >> the patches that were on (are they in the repos now?):
> > > >>
> > > >> http://linuxtv.org/wiki/index.php/Hauppauge_WinTV-NOVA-T-500
> > > >>
> > > >> After a short while, one of the tuners dies. I get a "(L__) Partial
> > > >> Lock" message from mythtv. If it's any help, I also get messages like:
> > > >>
> > > >> DVB: frontend 0 frequency limits undefined - fix the driver
> > > >>
> > > >> In syslog, but that's even when it's working fine.
> > > >
> > > > Weird issue that I never encountered since I started using the card in
> > > > August...
> > > >
> > > > Get a brand new tree, there have been a lot of changes very recently,
> > > > merge of old patches and new fixes too.
> > > >
> > > > Make sure that you have the right firmware too.
> > > >
> > > > Then do a cold reboot, going through a power down, then check in the
> > > > messages that the card was found in a cold state before a firmware
> > > > upload.
> > > >
> > > > http://linuxtv.org/wiki/index.php/Hauppauge_WinTV-NOVA-T-500#Firmware
> > > >
> > > > Nico
> >
> > Ben,
> >
> > I'm at loss for an explanation. I'm just not experiencing your problem.
> >
> > People with a better brain than mine will need to jump in.
> >
> > Have you tried turning debugging on for the modules, and get a more
> > verbose log from mythbackend ?
> >
> > Nico
> >
> >
> > _______________________________________________
> > linux-dvb mailing list
> > linux-dvb at linuxtv.org
> > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> 
> Hi,
> 
> I have been experiencing this problem for a few months now. I think it is 
> related to the use of the remote control. I have written a workaround 
> application for Ubuntu Linux that scans for a mt2060 error in the dmesg log. 
> If found it will restart mythtv-backend.  This seems to mitigate tha problem.
> 
> I can't wait for this issue to be fixed.
> 
> Shaun
> 
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