Public bug reported:

Binary package hint: linux-image-2.6.27-11-server

The available Ubuntu kernels are unusable on servers containing the
Marvell 6081 SATA chipset (e.g. Sun x4500's.)

A fix was merged in stable branch 2.6.28.4:

commit fc304eb4ccc0227d3230ce7a11b31f2d2bd43792
Author: Mark Lord <[email protected]>
Date:   Mon Jan 19 18:04:37 2009 -0500

    sata_mv: fix 8-port timeouts on 508x/6081 chips
    
    commit b0bccb18bc523d1d5060d25958f12438062829a9 upstream.
    
    Fix a longstanding bug for the 8-port Marvell Sata controllers (508x/6081),
    where accesses to the upper 4 ports would cause lost-interrupts / timeouts
    for the lower 4-ports.  With this patch, the 6081 boards should finally be
    reliable enough for mainstream use with Linux.
    
    Signed-off-by: Mark Lord <[email protected]>
    Signed-off-by: Jeff Garzik <[email protected]>
    Signed-off-by: Greg Kroah-Hartman <[email protected]>

Here's the original bug report that resulted in the fix:
https://bugzilla.redhat.com/process_bug.cgi

Can this patch be backported?:

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Ubuntu kernels are unusable with the Marvell 6081 SATA chipset
https://bugs.launchpad.net/bugs/336524
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