Comment 62 for bug 550559

addition:

when not using (noapic acpi=off) the errors look like this:

[ 1433.950104] ata10: limiting SATA link speed to 1.5 Gbps
[ 1433.950116] ata10.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 1433.972372] ata10.00: failed command: READ DMA EXT
[ 1433.983833] ata10.00: cmd 25/00:08:30:ac:16/00:00:1b:00:00/e0 tag 0 dma 4096 in
[ 1433.983836] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[ 1434.029995] ata10.00: status: { DRDY }
[ 1434.041694] ata10: hard resetting link

Thanks