[linux-dvb] Re: Tuning problems with TT DVB-C 1500 (saa7146 + stv0297) and QAM128

Michael Krufky mkrufky at m1k.net
Sat Aug 20 14:37:06 CEST 2005


Toni Lindroos wrote:
> Hi all,
> 
> I finally got my TT DVB-C 1500 card and (not surprisingly) tuning isn't 
> working the way it should be with QAM128 (I'm using kernel 2.6.13-rc3 
> and dvb-kernel from cvs). Disabling the corner detection and adding 
> about 10 seconds to every timeout in stv0297.c helped enough to get a 
> channels.conf generated from scan but tuning is still *very* unreliable 
> and very slow if it works at all. Looks like it gets a lock on some 
> channels easier than others. Has someone tried and found some reasonably 
> working timeout values for stv0297.c and what are they? I'm still 
> playing with them but it's quite frustrating without knowing more about 
> how the driver and tuning process work.

Toni-

A user in irc.freenode.net#linuxtv got good results by doing the 
following:  First, apply the disable-corner-edge-detection.patch, 
located here:

http://www.linuxtv.org/pipermail/linux-dvb/2005-June/002691.html

I know that you are already aware of this, I am only providing a link 
for anyone else reading this.

After applying the first patch, please apply this next (attached) patch 
with timeouts proven to work by Sami Vento...  Please let us know if 
this works for you.

Patrick-

Is there any reason why not to apply both this, and your 
disable-corner-edge-detection.patch to cvs?

This patch triples some timeouts in order to get the frontend to work. 
This is as close as we can get to the original values, while maintaining 
functionality of the device.

Signed-off-by: Sami Vento <sami.vento at tr.spt.fi>
Signed-off-by: Michael Krufky <mkrufky at m1k.net>

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