Upgraded to the latest BIOS, bug still present.

Here's what I did:
1. echo min_power |sudo tee 
/sys/class/scsi_host/host*/link_power_management_policy
2. Provoked disk activity by starting Firefox. Everything hangs for a while, 
messages in dmesg pasted below.
3. Returned to normal operation with: echo max_performance |sudo tee 
/sys/class/scsi_host/host*/link_power_management_policy

Requested output:
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
7LETD0WW (2.30 )
02/27/2012

dmesg output:
[  340.064083] ata3.00: exception Emask 0x0 SAct 0x1 SErr 0x40000 action 0x6 
frozen
[  340.064088] ata3: SError: { CommWake }
[  340.064092] ata3.00: failed command: READ FPDMA QUEUED
[  340.064099] ata3.00: cmd 60/18:00:df:85:9f/00:00:04:00:00/40 tag 0 ncq 12288 
in
[  340.064099]          res 40/00:00:00:4f:c2/00:01:00:00:00/00 Emask 0x4 
(timeout)
[  340.064102] ata3.00: status: { DRDY }
[  340.064108] ata3: hard resetting link
[  340.552105] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[  340.553225] ata3.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded
[  340.553230] ata3.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) 
filtered out
[  340.553449] ata3.00: ACPI cmd ef/5f:00:00:00:00:a0 (SET FEATURES) succeeded
[  340.553454] ata3.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered 
out
[  340.555876] ata3.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded
[  340.555882] ata3.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) 
filtered out
[  340.556077] ata3.00: ACPI cmd ef/5f:00:00:00:00:a0 (SET FEATURES) succeeded
[  340.556083] ata3.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered 
out
[  340.557176] ata3.00: configured for UDMA/100
[  340.557381] ata3.00: device reported invalid CHS sector 0
[  340.557395] ata3: EH complete

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https://bugs.launchpad.net/bugs/993507

Title:
  ATA errors when link_power_management_policy is min_power

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