[linux-dvb] [PATCH] TT Budget 1500 S

Oliver Endriss o.endriss at gmx.de
Tue Feb 21 06:27:50 CET 2006

Perceval Anichini wrote:
> On Sat, 2006-02-18 at 22:13 +0100, Oliver Endriss wrote:
> > Perceval Anichini wrote:
> > >   ttpci-tt-budget-1500s-fix fixed a S1500 issue : When set in
> > > vertical mode, the card loose the signal sync. The fix is to
> > > set the card in "high voltage mode". This has been confirmed
> > > from TechnoTrend. (Many thanks for their help)
> > 
> > Nak. You must not enable high voltage by default.
> 	If you don't enable high voltage, the card won't work.
> This is the mail I had from Technotrend :
> ...
>                 test |= 0x10; // LLC==1 ->
> +1Volt !!!!!!!!!!!!!!!!!!!!!!!!!!
> ...

Sorry, I'm still not sure whether it is correct. :-(

The question is (@all: Please correct me if I'm wrong):
(1) Does Hauppauge enable line-length-compensation for all cards, or
(2) is this a work-around for a design flaw of this specific card type?

Ad (1):
The DVB API has a special ioctl to compensate for voltage loss on the
LNB line. It is not correct to enable it by default (or the API has to
be changed).

If (2) holds true, we must not enable LLC for all cards with the LNBP21.
It should only be done for the 1500 S.

Obviously the card worked for the one who submitted the code.
Could you please measure the voltage at the LNBP input for a vertical
and a horizontal transponder?

Btw, are we talking about the card with sub-system id 0x1016 (Samsung
tuner) or sub-system id 0x1017 (ALPS tuner)?

Imho the patch is way too complicated. A simple 
|	lnbp21_enable_high_lnb_voltage(budget->dvb_frontend, 1);
after the lnbp21_init() call should do. Or did I miss something?


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