Comment 67 for bug 539467

uname -r: 2.6.38-020638rc5-generic

Model Family: Western Digital Scorpio Blue Serial ATA family
Device Model: WDC WD2500BEVS-22UST0
Serial Number: WD-WXE108A79290
Firmware Version: 01.01A01

See also comment #51 for my lspci

In my case the behavior is the same as with older kernels, however i changed the link power management policy on all the hosts with the following script:

#!/bin/sh
for X in /sys/class/scsi_host/*/link_power_management_policy; do
    echo "$1" > $X
done

used as sudo ./sata-link-policy min_power

Here's what i get - the drive led lights continuously for about 10 seconds during which any hdd access results in hanging process:
[12348.040077] ata3.00: exception Emask 0x0 SAct 0x1 SErr 0x150000 action 0x6 frozen
[12348.040086] ata3: SError: { PHYRdyChg CommWake Dispar }
[12348.040091] ata3.00: failed command: READ FPDMA QUEUED
[12348.040099] ata3.00: cmd 60/10:00:b0:94:c5/00:00:03:00:00/40 tag 0 ncq 8192 in
[12348.040101] res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
[12348.040104] ata3.00: status: { DRDY }
[12348.040112] ata3: hard resetting link
[12348.390082] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[12348.404414] ata3.00: configured for UDMA/133
[12348.404550] ata3.00: device reported invalid CHS sector 0
[12348.404570] ata3: EH complete