Michael Cowell wrote:
I had very similar problems with my Twinhan. It turned out to be
because of a shared interrupt (the bt878 chipsets don't play nicely
with others). Similarly to you, the problem only showed up in myth,
because myth was using the other device (another bt878, analog this
time). Other players didn't use the other device, so there was no
interrupt contention and no artefacts.
I'd cat /proc/interrupts to see if anything is sharing an interrupt
with you card - then shuffle them around (or change BIOS settings) to
get your twinhan its own irq. That fixed my problems.
Oh boy, I certainly hope you are right. I didn't think of interrupts,
but that certainly might be the problem. Turns out the card was sharing
interrupts with a whole bunch of stuff, including the SATA raid, nForce2
etc... I have moved it, physically and it is on a different interrupt
now (see below)
Initial testing seems to be clear of ALL sound glitches, and only some
very very minor video artifacts (which may be true reception problems).
If this works, I owe you big time... thank you
cat /proc/interrupts
CPU0
0: 171707 XT-PIC timer
1: 111 XT-PIC i8042
2: 0 XT-PIC cascade
5: 23939 XT-PIC ehci_hcd, bttv0, bt878
8: 1 XT-PIC rtc
10: 19884 XT-PIC ohci_hcd, eth0, NVidia nForce2
11: 9010 XT-PIC libata, ohci_hcd
12: 3 XT-PIC ohci1394
14: 1304 XT-PIC ide0
NMI: 0
LOC: 171665
ERR: 524
MIS: 0
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