https://bugzilla.novell.com/show_bug.cgi?id=816388
https://bugzilla.novell.com/show_bug.cgi?id=816388#c48
--- Comment #48 from Jean Delvare 2013-06-19 06:27:18 UTC ---
Note that hdparm -y leads to an even more aggressive power saving mode. It's
not only parking the head but also typically spinning down the motor. A more
accurate measurement would be with -B 128, and then comparing the maximum and
minimum values with CPU and graphics idle (HDD would be the only thing which
changes, from active idle to low power idle.)
I am curious where you get the mA values from, powertop doesn't show up
anything on my Thinkpad X230. I can only get values from
/proc/acpi/battery/BAT0/state and only when on battery. mA values aren't too
useful anyway if you don't know the voltage. Is it 11.1 V on your system as it
is on mine? Oddly enough despite the 11.1 V nominal battery voltage, ACPI
claims 12.3 V for me so I don't know if I can trust it.
7000 mA seems way too much to me for an idle laptop. Under 11-12V this is about
80 W, that's rather unrealistic. My X230 uses 9.5 W idle with internal display
off, measured at the power plug.
Either way, mW values from /proc/acpi/battery/BAT0/state (or an external
wattmeter as I do) are more interesting IMHO because you can compare them with
the specs from the drive vendor. For your drive they say:
* Performance idle 1.7 W
* Active idle 1.0 W
* Low power idle 0.8 W
I admit I have no idea what performance idle is supposed to be, but I suppose
the disk doesn't spend much time in this state as it consumes almost as much as
reads and writes. So basically I think we're speaking about a 200 mW difference
in your case. I am curious if you would find the same difference by
measurement.
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