I am using VIA/AMD64 chipset with kernel 2.6.23.1 (the same system mentioned
in my last posting about system instability).  Based on a reply to my
last post about system instability, I have disabled DMA in the ivtv driver.
It is still to early to port a result regarding system hangs,  but I am
with DMA disabled still seeing a problem that preceeded the DMA change:
the driver seems to "hang" on one of my two tuners, i.e. no video comes
out of the tuner, yet the user program just displays a black image with
no other indication of an error.  The frequency of the failure seems to
be directly related to system (i.e. disk I/O) load.

Attempts to reload ivtv (using modprobe -r or rmmod -f) fail.  It seems
that the only way to recover tuner function is a reboot.

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