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

[Ed Wildgoose <Ed@Wildgooses.com>]

Juergen Peitz wrote:

> Sunday, 20. April 2003 16:52 Ed Wildgoose wrote:
>
>  
> > 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...
> >    
> Can everybody who has tuning problems with the TT DVB-T card please try the 
> attached patch and report if it gives any improvement. This code is from 
> Holgers sp8872 driver and forces the card to use the given frontend 
> parameters.
> I also would like to know if this tuning problems also appear with the windows 
> driver. My card doesn't has this problem so I can't test it myself.
>
> Juergen 
>  
Hi Juergen,

Thanks for your interest.  I have tried this patch and the driver still 
dies in some way after just a few channel changes (a dozen or perhaps a 
few dozen or so).  The patch was applied against CVS from this afternoon.

Is there anything different about your actual card to mine though?  Do 
you have a different chipset?  (Is there perhaps a couple of different 
TT DVB-T 1.2 cards floating around?).  If so I would be interested to 
try and return my card to Hauppauge and get the one which works rather 
than mess around.  Which version of the firmware are you using? (I 
posted the MD5 of my version to the list, and also tried the previous 
firmware version, which appeared to be slightly worse)

Assuming that the cards are the same is there any other test that I 
could do to try and narrow down where the problem is actually coming 
from?  For me at least, the card *appears* to still be working, ie the 
tuner thinks it is tuning, its just that nothing comes out.  Someone 
mentioned that there was an onboard arm processor (?) if so, could it be 
this which is crashing, perhaps due to voltage fluctuations.  Is there a 
test I could run while the processor is crashed to prove or disprove this?

Ragnar Sundblad mentioned that voltage fluctation was indeed a factor 
with his card, 12v fans caused problems.  My machine is a dual processor 
1Ghz machine, and currently has 6 fans (4 on the 5v line, and 2 CPU fans 
with Zalman fan speed adjusters.  The CPU is running quite cool, 
however, there is every possibility that the power supply is not keeping 
up...?  (I also have 6 PCI/AGP cards in the machine...)

Thoughts appreciated

Ed



--
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.