The advantage to using s2both is that if the battery runs out while
suspended to ram, the system can still resume from disk (after power is
restored). The disadvantage is that it's slower, and most of the time
the disk image is never used.
This implementation of USuspendMethodAuto takes two integer arguments:
The first is a threshold (in terms of battery charge percentage) below
which s2disk will be used, on the theory that a laptop with a low
battery shouldn't waste any energy on suspending to ram. The second is a
threshold above which s2ram only is used, since it's faster and it's
less likely that a full battery will run out while suspended. In
between, s2both is used as a hedge.
hal is used to determine battery percentage. This may need
bulletproofing for non-hal systems.
Jason
--- ususpend.orig 2006-10-11 20:20:39.000000000 -0400
+++ /usr/share/hibernate/scriptlets.d/ususpend 2006-10-11 21:15:19.000000000
-0400
@@ -15,6 +15,31 @@
USUSPEND_PROG=s2disk
USUSPEND_RAM_FORCE=0
+GetHalBatteryPercentage() {
+ local battery charge
+ battery=`hal-find-by-capability --capability battery`
+ test "$battery" && \
+ charge=`hal-get-property --udi $battery --key
battery.charge_level.percentage`
+ test "$charge" || charge=0
+ echo $charge
+}
+
+USuspendChooseMethod() {
+ local s2both_threshold s2ram_threshold battery_percent
+ s2both_threshold=$1
+ s2ram_threshold=$2
+ battery_percent=`GetHalBatteryPercentage`
+
+ if [ $battery_percent -gt $s2ram_threshold ] ; then
+ USUSPEND_PROG=s2ram
+ elif [ $battery_percent -gt $s2both_threshold ] ; then
+ USUSPEND_PROG=s2both
+ else
+ USUSPEND_PROG=s2disk
+ fi
+ vecho 1 "Using method $USUSPEND_PROG for battery charge $battery_percent."
+}
+
USuspendConfigEnabler() {
case "$1" in
ususpendmethod)
@@ -38,6 +63,10 @@
fi
;;
+ ususpendmethodauto)
+ USuspendChooseMethod ${1:-25} ${2:-90}
+ ;;
+
ususpendramforce)
BoolIsOn "$1" "$2" && USUSPEND_RAM_FORCE=1 || return 0
;;
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