[linux-dvb] Re: TT DVB-T - Further problems

["Edward Wildgoose" <ed@wildgooses.com>]

> > b) after changing channel more than a dozen or so times the driver
> > appears to lock up, picture disappears from both TV output and also
> > /dev/dvb devices.... No errors in the log, everything still "appears" to
> > work fine, just no picture...
> >
> > This also happens quite repeatedly under vdr, and doesn't appear to be
> > dependent on visiting any special channel, eg just flick backwards and
> > forwards on the first couple and eventually the picture disappears, but
> > menus still pop up, vdr logs channel change events to syslog.
> >
> > tzap still appears to work ok, but "cat /dev/dvb/adaptor0/dvr0" doesn't
> > give anything....
>
> I have an identical card and have seen something similar from time
> to time. When this happens the values from tzap (status, signal)
> don't change no matter if I tune to another (radio) channel or what
> I do. I haven't looked into this yet, maybe it is the frontend
> that hangs, maybe it is something else. It starts to work again if
> I reload the driver, I don't have to reload the SP8870 firmware
> to get it going.

I didn't check exactly which module needed reloading.  I had one experience
where unloading just one module causes a hard lock of the machine (probably
random, but...), so I started unloading completely...

> I think this only happens with the older SP8870 firmware I have,
> on the other hand the older one is a little less sensitive to some
> disturbances I have and which I still haven't found out how to
> get rid of. (I had lots of problems before a changed power supply
> and a fan connection, but I still have had occasional problems.
> I have today discovered that it might be the DECT phone after
> all. The set top box decoder is much closer and has no problems...)
> The older firmware is 19920 bytes and has a md5 hash of
> b89a4b4ef7a74b8b629c7b84e5426d2a, the never is 20108 bytes with
> md5 hash 53970ec17a538945a6d8cb608a7b3899.


Interesting, I have

53970ec17a538945a6d8cb608a7b3899  /usr/lib/DVB/driver/frontends/Sc_main.mc

Which came from a CD labelled version 2.10a.  Where do I get updates from
anyway?  Would someone with a definitely working DVB-T and a different
version of the firmware to the above mind sending me a copy privately
(assuming no great copyright offence is being committed...)

For me the card stops working pretty quickly, often within a dozen channel
changes.  tzap *looks* like it is working, ie channel changes, and it
reports a varying signal strength and all the other stuff!  Very wierd.  It
looks like the tuner *is* actually still tuning, it just that there is no
output either on the analogue output, or via any of the internal inputs.

The only exception is right now the card has survived several dozen channel
changes and is still working (currently via kvdr)....  Nothing has
changed...

For the record I did also try moving the card around to different PCI slots
in case there was an interrupt conflict - no change.  And this is all on a
vanilla 2.40.20 kernel under gentoo.  I do have a dual CPU machine on a via
chipset motherboard, for what it's worth...



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