[ltp] Excessive power draw on T61

[Marius Gedminas]

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On Tue, Sep 25, 2007 at 09:50:33AM -0400, Mike Kershaw wrote:
> I've been trying to figure out what is causing high power consumption on
> a T61 with nvidia card:  Idle, in console or X, it draws approximately
> 20W..  The lowest I've seen it go is 17W.  Things I've done:
>=20
> * Everything powertop suggests, including HPET, USB suspend, dynclocks,
> etc.

My T61 (Intel video) uses 17--18W in idle, but after doing everything
powertop suggests *and* using xbacklight to set the LCD brightness down
to 10% (which is not really comfortable) I got it down to nearly 10W.

> * Cpufreqd scaling the processors down to 800mhz
> * Down to 30-50 wakeups while in console, 300 or so while in X
> * 90% of the time spent in C3 powersave
> * nvidia Coolbits option turned on
> * nvidia 100.14.19
> * nvidia module options NVreg_EnableBrightnessControl=3D3D1=3D20
>   NVreg_SoftEDIDs=3D3D0 NVreg_Mobile=3D3D3
> * Laptop-mode enabled
>=20
> Having wireless on or off doesn't seem to matter, nor does having usb mod=
ules
> loaded or not loaded.
>=20
> The fans are usually off, so it's not like the CPU is thrashing in a
> loop.  Running kernel 2.6.22.6.  Any suggestions for other things to try?

Have you tried reducing the screen brightness?  (I don't know what
NVreg_EnableBrightnessControl does)

Marius Gedminas
--=20
A "critic" is a man who creates nothing and thereby feels qualified to judge
the work of creative men. There is logic in this; he is unbiased -- he hates
all creative people equally.

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