[linux-dvb] distortions on P4 systems (12V hungry?)

[Andreas Vierengel <vdr@vierengel.de>]

Hi,

I have a Hauppauge/Nexus-s rev2.1 and a Nova-CI-s rev1.0 running with
VDR.
my cards are plugged to a SAT-Multiswitch with 8db damping. the cables
are 5-6 meter long.
from my multiswitch to my LNB (only Astra 19.2) I have about 25 meters
of cable length.

2 weeks ago I decided to buy new hardware (celeron 2.4GHz, MSI-6850,
256MB RAM, enermax-power supply)
until this point I used an old Asus-P2L97 with 433MHz(Celeron/P2).
This system runs without any problems for 32 month.

After switching to the P4 system, the cards produced ongoing
distortions, even on live-viewing.
So I tested several older hardware again:
P2 Celeron 433MHz ( no distortions )
P3 850MHz i440BX ( only few distortions )
P4 2.4GHz i845GE ( lot of distortions )

I fiddled around with pci-latency-settings, triple checked the io
system, swapped pci-slots but it's simply not stable.
I searched around in the list-archives and found people who has/have
problems with dvb-s cards, too. One suggestion seems to lead to the
power-supply. The cards seem to get unstable, if it get's not exactly
12V power supply.
Since Intel-CPU's are mostly 12V-hungry, that could be a problem.
Some people said, they had no problems with AMD-systems. AMD-processors
are 5V hungry, so this could be an explanation...

Is this a known stability-problem with dvb-s cards ?
What can I do to cure the problem ?
(I don't want to buy AMD or special power-supplies, if I'm not really
forced to :)

Thanks for any answer !

--Andi



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