I know some people who read my weblog entertain fantasies about publishing a book. Say you get your wish and someone publishes your book. But then it doesn’t sell. And no one wants to buy the stock from the publisher. What then? Real Live Preacher tells us.
Oh. My. After what seems like an eternal hiatus, dvfmama has written something!
God is as separate from His creation in as much as I am separate from my children. I have total sympathy for God.
When I saw Harald Sitter’s post about longer battery life on Linux, I decided to give it a try. Especially since, at the time, he hadn’t posted his script. Here is what I came up with:
#!/bin/sh # powertop says beagle takes up a lot of power killall beagled ############################################### # http://www.lesswatts.org/tips/disks.php # Disks! ############################################### # I don't need no stinkin' atime sudo mount -o remount,noatime / # Laptop mode works by submitting all future pending disk IO (such as # pending VM cache writebacks as described in the VM writeback time tip) # at once when the kernel has to do an IO to the disk for any reason sudo sh -c 'echo 5 > /proc/sys/vm/laptop_mode' # Only write to disk every 15s - we have a battery and few crashes. sudo sh -c 'echo 1500 > /proc/sys/vm/dirty_writeback_centisecs' # Turn on power management after 1 minute for i in `echo /dev/sd?`; do [ -e $i ] && sudo hdparm -B 1 -S 12 $i done # Turn off cdrom polling for i in `echo /dev/scd?`; do [ -e $i ] && sudo hal-disable-polling --device $i done ############################################### # http://www.lesswatts.org/tips/wireless.php # Wireless! ############################################### # WiFi power saving sudo iwpriv eth1 set_power 5 # turn off bluetooth sudo /etc/init.d/bluetooth stop sudo modprobe -r rfcomm sudo modprobe -r l2cap sudo modprobe -r bluetooth ############################################### # http://www.lesswatts.org/tips/cpu.php # CPU! ############################################### # Enable the power-aware SMP scheduler sudo sh -c 'echo 1 > /sys/devices/system/cpu/sched_mc_power_savings' ############################################### # http://www.lesswatts.org/tips/ethernet.php # Ethernet! ############################################### # turn off gigabit ethernet sudo ethtool -s eth0 autoneg off speed 100 # turn of WOL sudo ethtool -s eth0 wol d ############################################### # http://www.lesswatts.org/tips/graphics.php # Graphics/Video! ############################################### # turn the LCD backlight down to 12% # I found that xbacklight only works for certain values on my x60 xbacklight -set 12 # Turn off screen aff after 2minutes xset +dpms xset dpms 0 0 120 ############################################### # http://www.lesswatts.org/tips/misc.php # Misc! ############################################### # Turn on audio power saving if [ -e /sys/module/snd_hda_intel/parameters/power_save ]; then sudo sh -c 'echo 10 > /sys/module/snd_hda_intel/parameters/power_save' fi if [ -e /sys/module/snd_ac97_codec/parameters/power_save ]; then sudo sh -c 'echo 1 > /sys/module/snd_ac97_codec/parameters/power_save' sudo sh -c 'echo 1 > /dev/dsp' fi
Of course, you’ll want something to turn everything back on when you get back on power:
#!/bin/sh # Turn Beagle back on! beagled& # Turn off wifi powersaving sudo iwpriv eth1 set_power 6 # Write to disk more often sudo sh -c 'echo 300 > /proc/sys/vm/dirty_writeback_centisecs' # Disable the power-aware SMP scheduler sudo sh -c 'echo 0 > /sys/devices/system/cpu/sched_mc_power_savings' # turn on bluetooth sudo modprobe bluetooth sudo /etc/init.d/bluetooth start # turn on gigabit ethernet sudo ethtool -s eth0 autoneg on speed 100 # turn the LCD backlight up xbacklight -set 100 # Turn off screen aff after 30 minutes xset +dpms xset dpms 0 0 1800 # Turn on cdrom polling for i in `echo /dev/scd?`; do [ -e $i ] && sudo hal-enable-polling --device $i done
Note that I don’t reverse every step in my power-saving script. Just most of them.