[Debian-eeepc-devel] What is Super Hybrid Engine?

[Damyan Ivanov]

-=| Hans-J. Ullrich, Tue, May 11, 2010 at 07:33:29PM +0200 |=-
> My question:  What is the S.H.E. for? 

"Super Hybrid Engine" is fancy speak for extra power consumption 
management.

> Is S.H.E. a hardware based solution?

Sort of. It can be controlled by software.

> As I am using "powerdevil" in KDE, how does S.H.E. work with powerdevil, 
> exactly, which profile take precedenc: the powerdevil one, or that of S.H.E?

SHE is independent from any other power management you use (e.g. cpu 
frequency scaling).

> I suppose, S.H.E. is always available, for example, if Iam not 
> running KDE, but my second favourite windowmanager LXDE, isn't it?

It is.

> If there is a technical explantion, how S.H.E. is working in linux, 
> I will be happy, to read it.

From what I have seen, you write a magic numer to a special I/O 
register and the system bus/memory frequency/voltage is adjusted 
(over/under-clocked).

See the related code in eeepc-acpi-scripts for high-level details. If 
I am not mistaken, the default configuration underclocks the system 
when running on battery, and overclocks it when running on A/C power.

Hopefuly this answers some of your questions. ASUS aren't particulary 
generous on details.
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