[mythtv-users] Fw: [ivtv-users] PVR-150 fails after working for a few hours/days at a time, zero-byte recordings

[John Drescher]

On Fri, Aug 28, 2009 at 11:19 AM, John Drescher<drescherjm at gmail.com> wrote:
> On Fri, Aug 28, 2009 at 10:29 AM, Quinten
> Steenhuis<q.steenhuis at yahoo.com> wrote:
>>
>> This is a message I sent to the IVTV list, after searching the archives for a potential solution. My thought was to send it to the more specialized list, but if anyone has other ideas on this list, I'd be willing to try before spending more $$.
>>
>> Quick answer to Greg's questions:
>>
>>
>> Gigabyte GA-M78SM-S2H (from my memory-may be slightly different model), with Athlon 64 X2.
>> DDR ram, two modules
>> Mythbuntu 8.10
>> Kernel 2.6.27-14 SMP (stock mythbuntu, but I did download and install custom ALSA modules)
>>
>> It generally works for a short while, sometimes for a few days, before the error pops up. When the error occurs, I can't record via MythTV or via cat /dev/video0 | mplayer -
>>
>> My other tuner, an HD Homerun, works.
>>
>>
>> ----- Forwarded Message ----
>>>
>>> Hi,
>>>
>>> I have a pvr-150 low profile card, which I use for watching analog cable tv.
>>>
>>> Usually it works briefly after a reboot, but inevitably I get the dreaded DMA
>>> errors, which look like this:
>>>
>>> [104235.184516] ivtv0: DMA TIMEOUT 00000001 0
>>>
>
> This used to happen for some users several years ago (even before the
> driver made it into the mainline kernel). I had this on my master
> backend back in 2007 or so.. However I have not had not seen that
> since and I also have not  seen much of this on the last 2 years or
> so. Two things I remember from back then to try were disabling
> frequency scaling and/or disabling SMP.
>
> Also (i just remembered) you can completely get around the DMA problem
> by forcing the ivtv driver to use PIO instead. This is what I did on
> the ivtv 0.10.X out of kernel driver. I am not sure if this workaround
> still works on the in source kernel.
>
> Here is the patch for 0.10.X
>
> http://github.com/drescherjm/jmdgentoooverlay/blob/46cad12ba2d03a9c1a85f64663382d31e21a429e/media-tv/ivtv/files/ivtv-0.10.3-pio.patch
>
> John
>

http://www.gossamer-threads.com/lists/ivtv/users/35897

-- 
John M. Drescher