[ltp] X60 power consumption

[Andrew Mason]

The power consumption on my X200 is fairly similar. It's recently
gotten a little better with the newer kernels, especially with WiFi
disabled but atm there are a few power related issues with Linux and
I'm not really knowledgable enough to tell you where they are. I know
that my fan doesn't return to a lower / off state after its cooled
down, i think that my hard disk spins up more often than it needs to
and I know that based on powertop , the system wakes up more than i
think it should.

On Sun, Jun 21, 2009 at 6:54 AM, Richard Neill<rn214@hermes.cam.ac.uk> wrote:
>
>
> 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
>
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