<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On Mar 8, 2006, at 4:06 PM, Joshua Frank wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite">I have pvr-250 card that after a few days of recording with start to show image defects in the recordings and whiles displaying live tv. After I reboot the problem goes away for a couple of days. I have multiple cards in the system and this isn't the first time this happened. The first time it was the same problem with my pvr-350 card. All the other cards will work fine just one tuner goes a little flaky.<BR> I get an interesting result when I run:<BR> debian:~# cat /proc/interrupts<BR> CPU0<BR> 0: 634699 IO-APIC-edge timer<BR> 1: 40 IO-APIC-edge i8042<BR> 2: 0 XT-PIC cascade<BR> 8: 4 IO-APIC-edge rtc<BR> 14: 9774 IO-APIC-edge ide0<BR> 15: 116 IO-APIC-edge ide1<BR> 137: 376581 IO-APIC-level ivtv0<BR> 145: 424 IO-APIC-level ivtv1<BR> 153: 1173 IO-APIC-level ivtv2, eth0<BR> 161: 9001 IO-APIC-level ivtv3<BR> 169: 0 IO-APIC-level VIA8237<BR> NMI: 0<BR> LOC: 634652<BR> ERR: 0<BR> MIS: 0<BR> <BR> For the ivtv0 card which is the one that is acting up the CPU0 number is way higher than the rest even on a fresh boot. This number also goes up even when the card is idle. I'm running ivtv-0.4.3 stable drivers <A href="http://2.6.15.4">2.6.15.4</A> kernel and mythtv 0.19 so I don't think I can update software any further. Has anyone seen this problem before? I'm not sure if it's ivtv, mythtv or just debian related.<BR></BLOCKQUOTE>What sort of "image defects" ? The typical "digital breakup" of little squares and such ??<BR></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I can't explain why it would be happening only after some uptime, but I notice that you are using a VIA-based motherboard.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I had this sort of problem with a Via mobo before I adjusted the PCI latency values. Check your boot log for an "Unreasonably low latency" message from IVTV, and check the page on PCI_Latency on the WiKi.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I can't be certain if your problem is related to this, but increasing the latency on my IDE controller eliminated all of the artifacts I was getting on that system. My problems were more related to system load though, and didn't seem to be related to uptime.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Older VIA chipsets had DMA problems that, in some cases, were insurmountable on MythTV systems, due to extensive use of DMA to transfer data. There is some info on this on the IVTV site, but again, I have no idea if this is related to your problem.</DIV></BODY></HTML>