[linux-dvb] random memory corruptions with asus p7131 (Re: asus p7131 vs ZDF?)

hermann pitton hermann-pitton at arcor.de
Sat Oct 20 00:05:51 CEST 2007


Am Freitag, den 19.10.2007, 20:34 +0100 schrieb Mauro Carvalho Chehab:
> > Wait! Please clarify whether you think that your problem is caused by
> > the _saa7134_ driver or the _saa7146_ driver.
> > 
> > You wrote 'that <memory corruption> is caused by the saa7146 driver,'
> > Is this a typo? Did you mean saa7134?
> 
> You are right my statement is wrong. To get it right, my asus has the
> • tda10046a
> • saa7131e
> and not the saa7146 (which my brain generated using the numbers 7131 /
> 10046).
> 
> On saa7131 board, the memory corruptions may be caused by V4L overlay 
> interface. On overlay mode, the driver sets the device to do a PCI2PCI memory 
> transfer. This is known to cause troubles with some VIA and SIS motherboards.
> 
> If you load saa7134 with no_overlay=1, overlay mode will be disabled. Could 
> you please test if this solves the issue?
> 
> AFAIK, some newer motherboards that had this problem can be corrected by 
> upgrading its bios.

That was what I told Soeren in the very beginning,
but he does not even use any analog TV.

The only case that I know of, that can cause menmory or file system
corruption on that driver, is using DVB-T at once with planar video
formats from other external inputs.

Needs packed formats, because of some dma engines limitation here,
according to Hartmut.

Since we have other users of this later revision of that card, maybe not
hardcored enough to run it over weeks, we should have at least one more
to confirm that problem.

I do not deny, that there can be an undiscovered issue.

We had something similar with signal detection flaws previously on
analog. Some apps did show it within 20 minutes, others only after two
weeks ... Have not seen it myself until today, but was true.

Cheers,
Hermann





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