1 files changed, 55 insertions, 0 deletions
diff --git a/src/pm-powersave b/src/pm-powersave
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+#!/bin/sh
+
+# Simple low-power-mode script
+# Based on work from:
+#    Bill Nottingham <notting@redhat.com>
+#    Peter Jones <pjones@redhat.com>
+#    David Zeuthen <davidz@redhat.com>
+#    Richard Hughes <richard@hughsie.com>
+#
+# Values are taken from the laptop-tools package
+#    Bart Samwel <bart@samwel.tk>
+
+if [ "$1" == "true" ] ; then
+    echo "SetLowPower ON"
+    DISK_IDLE_SECS=2
+    DIRTY_WRITEBACK=30
+    DIRTY_EXPIRE=30
+    DIRTY_RATIO=60
+    DIRTY_BACKGROUND_RATIO=1
+elif [ "$1" == "false" ] ; then
+    echo "SetLowPower OFF"
+    DISK_IDLE_SECS=0
+    DIRTY_WRITEBACK=500
+    DIRTY_EXPIRE=3000
+    DIRTY_RATIO=40
+    DIRTY_BACKGROUND_RATIO=10
+else
+    echo "Argument needs to be true or false"
+    exit 1
+fi
+
+if [ ! -w "/proc/sys/vm/" ] ; then
+    # Use the raw kernel sysfs interface
+    echo "You do not have write access to /proc/sys/vm/"
+    exit 1
+fi
+
+# Seconds laptop mode has to to wait after the disk
+# goes idle before doing a sync.
+echo $DISK_IDLE_SECS > /proc/sys/vm/laptop_mode
+
+# Set dirty page values
+echo $DIRTY_WRITEBACK > /proc/sys/vm/dirty_writeback_centisecs
+echo $DIRTY_EXPIRE > /proc/sys/vm/dirty_expire_centisecs
+
+# Dirty synchronous ratio.  At this percentage of dirty
+# pages the process which calls write() does its own writeback.
+echo $DIRTY_RATIO > /proc/sys/vm/dirty_ratio
+
+# Allowed dirty background ratio, in percent.
+# Once DIRTY_RATIO has been exceeded, the kernel will wake pdflush
+# which will then reduce the amount of dirty memory to 
+# dirty_background_ratio.  Set this nice and low, so once some
+# writeout has commenced, we do a lot of it.
+echo $DIRTY_BACKGROUND_RATIO > /proc/sys/vm/dirty_background_ratio