Comment 18 for bug 297058

I had my disk sleeping with hdparm -S 12 (60 seconds). It has no activity (and it's unmounted) so I should stay sleeping for very long time. Even so, the disk is constantly waking up (every 15 minutes or so) and then sleeping again and I get these errors on dmesg:

[160245.988251] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[160245.988266] ata1.00: cmd b0/d1:01:00:4f:c2/00:00:00:00:00/00 tag 0 pio 512 in
[160245.988268] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[160245.988273] ata1.00: status: { DRDY }
[160246.492039] ata1: soft resetting link
[160246.673890] ata1.00: configured for UDMA/100
[160246.673926] ata1: EH complete
[162046.000069] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[162046.000085] ata1.00: cmd b0/d1:01:00:4f:c2/00:00:00:00:00/00 tag 0 pio 512 in
[162046.000087] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[162046.000092] ata1.00: status: { DRDY }
[162046.508034] ata1: soft resetting link
[162046.689875] ata1.00: configured for UDMA/100
[162046.689912] ata1: EH complete

The strange thing is that the disk wakes up, gives this error, then goes immediately to sleep, in like 10 seconds, not respecting the 60 seconds sleep time in hdparm.