[Powertop] Powertop usage

[Powertop] Powertop usage

[Pascal Fontaine]

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Hi,

I have trouble understanding the output of powertop on my macbook air:

Power est.              Usage       Events/s    Category Description
   5.34 W    100.0%                      Device         USB device: 
Apple Internal Keyboard / Trackpad (Apple Inc.)
   889 mW     15.8 ms/s     168.2        Process /usr/bin/X :0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
   729 mW      2.9 pkts/s                Device Network interface: eth0 (wl)

despite tweaking everything possible about the Apple keyboard.  My 
global consumption is 8 Watts, so I find really strange 2/3 of it is in 
the keyboard.

Is, for some reason, powertop attributing to the apple keyboard the 
consumption overhead of the computer?

Thanks in advance for answers, and thanks to the powertop developers for 
their tool,

   Pascal

Re: [Powertop] Powertop usage

[Arjan van de Ven]

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On 1/19/2013 6:12 AM, Pascal Fontaine wrote:
>    5.34 W    100.0%                      Device         USB device: Apple Internal Keyboard / Trackpad (Apple Inc.)

the keyboard may also be the part that is keeping your CPU out of power savings state
that "tax" is attributed to the device, not the cpu.

Re: [Powertop] Powertop usage

[Howard, James D]

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Is there any way, today, to tell a "good" keyboard / keyboard chip -- i.e. one that handles sleep, power-save, wake-up correctly, and the many we still find that keep the CPUs awake? For the moment, it seems hit-or-miss whether I grab a keyboard that's "good" or "bad" - even one recently purchased.

-----Original Message-----
From: Arjan van de Ven [arjan(a)linux.intel.com<mailto:arjan(a)linux.intel.com>]
Sent: Monday, January 21, 2013 08:25 AM Pacific Standard Time
To: Pascal Fontaine
Cc: powertop(a)lists.01.org
Subject: Re: [Powertop] Powertop usage


On 1/19/2013 6:12 AM, Pascal Fontaine wrote:
>    5.34 W    100.0%                      Device         USB device: Apple Internal Keyboard / Trackpad (Apple Inc.)

the keyboard may also be the part that is keeping your CPU out of power savings state
that "tax" is attributed to the device, not the cpu.
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