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From: Mark Zimmerman <markzimm@frii.com>
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Subject: Re: Tuning channels with DViCO FusionHDTV7 Dual Express
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On Mon, Feb 07, 2011 at 06:54:30PM -0500, Andy Walls wrote:
> 
> You perhaps could 
> 
> A. provide the smallest window of known good vs known bad kernel
> versions.  Maybe someone with time and hardware can 'git bisect' the
> issue down to the problem commit.  (I'm guessing this problem might be
> specific to a particular 64 bit platform IOMMU type, given the bad
> dma_ops pointer.)
> 

FYI: I am on the process of doing a git bisect (10 kernels to go) to
track down this problem:

http://www.mail-archive.com/linux-media@vger.kernel.org/msg25342.html

Which may or may not be related to the problem in this thread.