Notes for power saving on my i5 laptop.
/etc/rc.local 🔗
# SATA power save
echo medium_power | tee /sys/class/scsi_host/host*/link_power_management_policy > /dev/null
# Set minimum performance to 30% of CPU MHz
echo 30 > /sys/devices/system/cpu/intel_pstate/min_perf_pct
# Set CPU governor to power save since we run on a laptop
# Valid values: powersave performance
echo powersave | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor > /dev/null
# Increase for CrashPlan so unlocking gnome-shell lock screen works
echo 1048576 > /proc/sys/fs/inotify/max_user_watches
/etc/default/grub 🔗
# Make my back light buttons work correctly
# Full power save for GPU
GRUB_CMDLINE_LINUX="video.use_native_backlight=1 i915.enable_rc6=7 i915.enable_fbc=1 i915.lvds_downclock=1"