Comment 9 for bug 993507

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