On 1/26/2011 9:57 PM, Cory Coager wrote:
This is a fairly recent problem that I am having. This machine has been working
fine for about 6 years now.
When I have the issue, the tuner stops working all together. Mythtv no longer
records on that specific tuner, LiveTV locks up and the only fix is to reboot.
Some of the other tuners still function however.
Not sure if these messages are related:
Jan 26 21:01:07 mythtv kernel: [344307.990288] ivtv2: DMA TIMEOUT 00000001 0
Jan 26 21:01:10 mythtv kernel: [344310.960064] ivtv2: DMA TIMEOUT 00000001 0
Jan 26 21:01:13 mythtv kernel: [344313.929838] ivtv2: DMA TIMEOUT 00000001 0
Jan 26 21:01:16 mythtv kernel: [344316.899616] ivtv2: DMA TIMEOUT 00000001 0
Jan 26 21:01:18 mythtv kernel: [344319.869406] ivtv2: DMA TIMEOUT 00000001 0
Jan 26 21:01:22 mythtv kernel: [344323.372477] ivtv2: DMA TIMEOUT 00000001 0
Jan 26 21:01:25 mythtv kernel: [344326.342257] ivtv2: DMA TIMEOUT 00000001 0
Jan 26 21:01:28 mythtv kernel: [344329.345369] ivtv2: DMA TIMEOUT 00000001 0
I recently upgraded my processor from an AMD 3200+ single core to a 3800+ dual
core. I also had to recompile the kernel to enable SMP. This may or may not be
related but its the only recent changes to this machine.
My system:
Gentoo
uname = Linux mythtv 2.6.31-gentoo-r6 #6 SMP Wed Dec 22 18:08:38 EST 2010
x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ AuthenticAMD GNU/Linux
Motherboard = Asus A8N32-SLI-Deluxe
CPU = AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
2 PVR-500's
ivtv driver version 1.4.1
mythtv version 0.23_alpha24158
I had a similar problem with an AMD Athlon X2 4850e and an ASUS M3N78 Pro mobo.
The problem was related to AMD Cool n Quiet. When the kernel's ondemand
governor lowered the CPU frequency, it also starved the PCI bus. Apparently,
it's an issue with my CPU, and maybe with yours, although not with the Athlon
II series. It may be possible to experiment with increasing the minimum CPU
frequency to prevent the problem. But I couldn't find a frequency that worked
reliably for my configuration, which includes a PVR-150 and a pcHDTV 5500. Plus
I found that using Cool n Quiet and the ondemand governor wasn't really
reducing the system's energy usage. Readings with a kill-a-watt didn't show
much difference when the CPU was scaled down one or two notches. So I just went
into the BIOS and disabled Cool n Quiet. Before I made that change last
November, the system needed to be rebooted about twice a week, and it's a
system that doesn't do a lot of recording. Since I made that change, we ha
ven't had any incomplete or failed recordings.
HTH,
Helen
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