[linux-dvb] cx88-dvb: fix nxt200x rf input switching broke my tuner? :)

Michael Krufky mkrufky at linuxtv.org
Wed Sep 5 20:06:42 CEST 2007

 > -----Original Message-----
 > From: CityK [mailto:CityK at rogers.com]
 > Sent: Wednesday, September 05, 2007 1:33 PM
 > To: Nathan Faust
 > Cc: linux-dvb at linuxtv.org
 > Subject: Re: [linux-dvb] cx88-dvb: fix nxt200x rf input switching broke
 > my tuner? :)
 > Nathan Faust wrote:
 >> Hi,
 >> I've notice the same thing with my Kworld ATSC-110.
 >> I'm running Ubuntu 7.10, 2.6.22-10-generic, x86_64.  I guess it is a
 >> change in the 2.6.22 kernel.
 >> Is there anyway to change this back so that QAM and NTSC inputs are
 >> the same?
 > They should be the same now -- that was what the change was all about.
 > By default now, the top RF input should be 8VSB and the bottom should be
 > QAM & analog (both ota and cable).

Nathan Faust wrote:
> CityK,
> Thanks for your reply, but that is not what I'm seeing in MythTV and
> TVTime for /dev/video0.  I'm getting signal from /dev/video0 when I use
> the upper input, not the lower one.  I haven't trying tuning 8VSB, but
> as for the QAM input, that seems to be working as expected.
> Maybe I should look at the driver config for input select in SAA7134 or
> swap the input selection lines for VSB and QAM in the dvb code?
> After looking at the input selection code in nxt200x.c, QAM and VSB, it
> looks like if I switch these lines it will swap the inputs.
> 	//QAM
> -	state->config->set_pll_input(buf+1, 1); 
> +	state->config->set_pll_input(buf+1, 0);
> 	//VSB
> -	state->config->set_pll_input(buf+1, 0);
> +	state->config->set_pll_input(buf+1, 1);
> Am I correct?
> I am confused as to what these lines do
> 	if (state->config->set_ts_params)
> 		state->config->set_ts_params(fe, 1);  <-- what the
> front-end parameter 0 or 1 mean.


Please do not top-quote....

As per your description above, you are correct... HOWEVER, now I understand your 
issue -- you are running old code.

If you update to the latest v4l/dvb modules via linuxtv.org mercurial, you will 
find that functionality has been restored as per your desire.

Please see http://linuxtv.org/repo

...for instructions to upgrade your v4l/dvb modules.

Good Luck,


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