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Aggressive Link Power Management (ALPM)

37 bytes added, 12:39, 17 December 2015
== Overview ==
Aggressive Link Power Management (ALPM) is a mechanism for reducing SSD/HDD power consumption.
If ALPM is enabled, SSD goes into low-power mode when SSD has no I/O activity. On I/O request, SSD power is resumed.
=== Enabling ALPM in Windows ===
* HIPM = Host Initiated Link Power Management
* DIPM = Device Initiated Link Power Management
:::::* ALPM – Adaptive. It will set the period of AHCI link idle time before the link is put in the slumber state when you have HIPM, DIPM, HIPM+DIPM or Lowest set above. It can be set to be from 0 to 300,000 milliseconds. If the Active is set above, then this will have no effect.
=== Enabling ALPM in Linux === 
* Create text file /etc/pm/power.d/sata_alpm
#!/bin/sh
for i in /sys/class/scsi_host/host*/link_power_management_policy; do
echo min_power > $i
min_power
min_power
  * To disable ALPM simply delete:<br>file /etc/pm/power.d/sata_alpm sudo rm /etc/pm/power.d/sata_alpm file
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