[ltp] X60 power consumption

[Richard Neill]

Nils Faerber wrote:

Thanks, Nils,
> 
> Which one was that?

I'll let you know when I trace it...
> 
> echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> hdparm -B 254 /dev/sda > /dev/null
> ifconfig eth1 up
> echo 7 > /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/power_level
> echo 5 > /proc/sys/vm/laptop_mode
> ethtool -s eth0 wol d
> echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
> echo "auto" > `hal-get-property --udi \
> /org/freedesktop/Hal/devices/usb_device_483_2016_noserial --key \
> linux.sysfs_path`/power/level
> echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
> echo shutdown > /sys/power/disk

Very useful. Am I correct in assuming that laptop-mode is irrelevant if 
I have an SSD?

> 
> Using this I can get about 9 to 9.5W with WiFi enabled which is IMHO OK.
> (And no need to unload the uhci-hcd module...)
> 
> It is still way too much and the fan still spins almost all the time but
> a lot of the power now goes into the chipset and graphics and there is
> little we can do there - at least from what I know.

I'm still at 11W here.

I did get the fan to stop, very useful to simply install tp-fand, and
set the thresholds to 65 degrees. This is too hot for lap-top use, but
fine for a table.
http://www.gambitchess.org/mediawiki/index.php/ThinkPad_Fan_Control#Ubuntu_8.04_.2F_8.10_.2F_9.04

> 
> If you have it installed watch the powertop output and see if your CPU
> stays in C4 most of the time. If not, find the course.

Aha. I am almost always in C3 (at 1GHz) but never see C4. It's not even 
shown as an possibility in powertop. Any ideas why this could be?

Richard