Adaptec 2940UW with Fujitsu MAN3184M

[acheron]

I am having the same problem as you. However, a useful info may be that the
issue is related to the Linux kernel version I am using. There is a
corresponding report at:

    http://bugzilla.kernel.org/show_bug.cgi?id=5808 .

It is possible to recover FAST-20 mode by downgrading to kernel 2.6.12. For
2.6.13 and later, only FAST-10 mode is negociated. One can verify this on
the fly by using a live CD like the one of Ubuntu 5.10 for which the full
speed is achieved.
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