Berck E. Nash wrote:
> AHCI pauses heartily on during detection boot, but eventually proceeds. 
>  This problem currently exists with 2.6.19-rc2-mm1, but did not exist in 
> 2.6.17.3.  I realize that's a huge gap, and if you'd like me to narrow 
> it down, I'll be glad to try.

Can you try the attached patch?  And please post the result of hdparm -I 
/dev/sdX.

-- 
tejun