- WIP patch to add support for SATA ALPM

[packages/laptop-mode-tools.git] / sata-alpm.patch

--- /dev/null	2017-02-28 21:16:52.000000000 +0100
+++ laptop-mode-tools-1.71/usr/share/laptop-mode-tools/modules/sata-alpm	2017-03-04 10:16:55.823426823 +0100
@@ -0,0 +1,26 @@
+#!/bin/sh
+#
+# SATA link power management
+
+if [ "$KLEVEL" = "2.6" -a "$KMINOR" -lt 33 ] ; then
+	log "VERBOSE" "Changing SATA link power management may cause filesystem corruption on kernels before 2.6.33. Disabling."
+	CONTROL_SATA_ALPM=0
+fi
+
+if [ x$CONTROL_SATA_ALPM = x1 ] || [ x$ENABLE_AUTO_MODULES = x1 -a x$CONTROL_SATA_ALPM = xauto ]; then
+	if [ $ON_AC -eq 1 ] ; then
+		if [ "$ACTIVATE" -eq 1 ] ; then
+			SATA_LINK_POLICY="$LM_AC_SATA_LINK_POLICY"
+		else
+			SATA_LINK_POLICY="$NOLM_AC_SATA_LINK_POLICY"
+		fi
+	else
+		SATA_LINK_POLICY="$BATT_SATA_LINK_POLICY"
+	fi
+	for SATAHOST in /sys/class/scsi_host/host*; do
+		if [ -w "$SATAHOST/link_power_management_policy" ]; then
+			log "VERBOSE" "Setting SATA APLM on $SATAHOST to $SATA_LINK_POLICY."
+			echo "$SATA_LINK_POLICY" > "$SATAHOST/link_power_management_policy"
+		fi
+	done
+fi
--- /dev/null	2017-02-28 21:16:52.000000000 +0100
+++ laptop-mode-tools-1.71/etc/laptop-mode/conf.d/sata-alpm.conf	2017-03-04 10:16:16.082421957 +0100
@@ -0,0 +1,57 @@
+#
+# Configuration file for Laptop Mode Tools module sata-alpm.
+#
+# For more information, consult the laptop-mode.conf(8) manual page.
+#
+
+###############################################################################
+# SATA link power management
+# ------------------------------------
+#
+#__COMMENT Laptop mode tools can automatically adjust SATA link power management policy
+#__COMMENT setting.
+#__COMMENT
+#__COMMENT This hook tries to save power by allowing SATA controllers to
+#__COMMENT reduce power usage when the SATA subsystem is otherwise idle.
+#__COMMEN
+#__COMMENT This adds a little bit of latency to drive accesses in
+#__COMMENT exchange for moderate power savings if you are not using the drive.
+#__COMMENT
+#__COMMENT see kernel commit 6013efd8860bf15c1f86f365332642cfe557152f
+#__COMMENT
+#__COMMENT This feature only works on 2.6.33+ kernels.
+###############################################################################
+
+# Enable debug mode for this module
+# Set to 1 if you want to debug this module
+DEBUG=0
+
+#
+# Should laptop mode tools control SATA link power settings?
+#
+# Set to 0 to disable
+SATA_ALPM_FREQUENCY="auto"
+
+
+#
+# This parameter allows the user to set the link (interface) power management.
+# There are 3 possible options:
+#
+# Value                 Effect
+# ----------------------------------------------------------------------------
+# min_power             Tell the controller to try to make the link use the
+#                       least possible power when possible.  This may
+#                       sacrifice some performance due to increased latency
+#                       when coming out of lower power states.
+#
+# max_performance       Generally, this means no power management.  Tell
+#                       the controller to have performance be a priority
+#                       over power management.
+#
+# medium_power          Tell the controller to enter a lower power state
+#                       when possible, but do not enter the lowest power
+#                       state, thus improving latency over min_power setting.
+#
+BATT_SATA_LINK_POLICY=min_power
+LM_AC_SATA_LINK_POLICY=max_performance
+NOLM_AC_SATA_LINK_POLICY=max_performance