By Date: <-- -->
By Thread: <-- -->

Pinnacle PCTV40i analogue noise with recent kernel versions

> Well, the eeprom dump has an unusual structure, but what i see is as
> expected.
> Tuner is regular TDA8275A, analog only with FM radio, right?

Yes. Analog only with FM radio.

> And if you problem occurs with the composite input, the tuner is out of the
> game anyway...
> The funny thing is that you have problems with the I2C bus. Are your
> mainboards
> the same type? I somehow suspect the power supply. There also might be some
> special - GPIO controlled power save mode i don't know about. On the
> board with
> eeprom read failure: Does the problem still exist after you rebooted the
> machine
> without power cycle?

One of the cards which reported the dump was running in a different
mainboard, but also on SuSE 10.0. The other cards were in identical
machines running on Debian. One of these also reported the dump. This
machine had a different kernel build (2.6.15-1-686-smp-2.6.15-3) than
the others (2.6.14 and 2.6.15-1-686-smp-2.6.15-4). After upgrading to
the newer build, this machine also stopped reporting. But downgrading
again didn't restore the old behavior, so I tried power cycling. This
worked on the first try, but wasn't reproducable again. I tried a card
in a Debian machine similar to the SuSE box and also didn't get a
report. I think "works sometimes" is not what you wanted to hear... ;-)

Maybe it's something related with the debian kernel.

Lets get back to the noise. It is always reproducable that the noise
exists in 2.6.15, while I don't have a noise with 2.6.12 (same machine
with both kernels not dumping the eeprom content). So we should try to
concentrate on the software change that caused the difference.

I finally managed to set up the kernel sources properly for compiling
the Mercurial v4l tree. So do you have any ideas where I could start?

I uploaded two example grabs for noise and clear picture to my web site.
The files contain 50 frames 720x576 in plain 4:2:0 YUV format packed
with zip.

http://iphome.hhi.de/suehring/tmp/out_dist.zip (20MB)
http://iphome.hhi.de/suehring/tmp/out_clear.zip (15MB)

A player for this format can be found at the following url:
http://www.tnt.uni-hannover.de/~vatis/yuvplayer.html

Best regards,
Karsten

--
video4linux-list mailing list
Unsubscribe mailto:video4linux-list-request (at) redhat.com?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/video4linux-list