firewire issue when running dvswitch/dvgrab

[Erwann T. <erw...@su...>]

Hello list,

I am facing a problem when using dvswitch and a firewire cam.

After having started dvswitch and dvsource, i wait for 2 or 3 minutes
(sometimes less), and dvsource looses the firewire stream, with this
message in log files:

firewire_ohci 0000:05:00.0: DMA context IR0 has stopped, error code:
evt_descriptor_read

I tried to turn on debugging messages:
# rmmod firewire_ohci
# modprobe firewire_ohci debug=7
# echo 8 > /proc/sysrq-trigger

... no crashes anymore! (except filling debug files, it works like a
charm for hours) <- that is what i wrote to dvswitch-devel ML, but it
eventually crashes, much more lately though.

After this error, the computer usually freezes for about 5 minutes and
then comes back to life.

Upon advices of Carl@dvswitch-devel, i ran dvgrab -debug video instead
of using the whole dvswitch suite. The problem still happens, and i
don't have more information from dvgrab's debug output.

Finally, on more information i've discovered this morning: these issues
happens when the laptop is on battery. Until now, i don't face any issue
when plugged to AC.


My setup is as follow:
Macbook pro with debian stable (wheezy + backports)
Sony HVR-A1E firewire cam

linux-image-3.16-0.bpo.3-amd64 (it used to be 3.2.0, i tried to upgrade
to get rid of these crashes)
dvswitch, dvsink, dvsource 0.8.3.6-1+b2
dvgrab 3.5-2
05:00.0 FireWire (IEEE 1394): LSI Corporation FW643 [TrueFire] PCIe
1394b Controller (rev 07)


Is there something wrong with my setup?
Any idea about how to find the issue?

Any help would be greatly appreciated :)

Cheers,
Erwann