Further research shows that this defect is new to kernel version 2.6.14.
I've tested 2.6.13 and a couple of previous kernels, and they
correctly negotiate U160.
With 2.6.13, I am now receiving the expected 60+ MB per second with
uncompressed data.
The defect appears to still be present in 2.6.15-rc4.
Hints and suggestions welcomed.
Thanks,
Denny
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