So I have a 'spare' internal spinning rust bucket which I only use for backups, and so most of the time when I'm not using it I put it to sleep with:
sudo hdparm -Y /dev/sda Unfortunately the kernel wakes the drive up again: Aug 27 19:44:40 eye kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 Aug 27 19:44:40 eye kernel: ata1.00: waking up from sleep Aug 27 19:44:40 eye kernel: ata1: hard resetting link Aug 27 19:44:41 eye kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) Aug 27 19:44:41 eye kernel: ata1.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded Aug 27 19:44:41 eye kernel: ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out Aug 27 19:44:41 eye kernel: ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out Aug 27 19:44:43 eye kernel: ata1.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded Aug 27 19:44:43 eye kernel: ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out Aug 27 19:44:43 eye kernel: ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out Aug 27 19:44:43 eye kernel: ata1.00: configured for UDMA/133 Aug 27 19:44:43 eye kernel: ata1: EH complete Why is the kernel doing this, and how do I stop it from happening? TIA,
