[Debian-eeepc-devel] Super Hybrid Engine on eeepc 901c with kernel 2.6.31-6

[Shawn Lamson]

On Thu, 17 Dec 2009 14:24:10 +0000
Darren Salt <linux at youmustbejoking.demon.co.uk> wrote:

> I demand that Shawn Lamson may or may not have written...
> 
> > I recently upgraded from a stock debian kernel to a custom compiled
> > 2.6.31-6 in order to resolve the issue with the rt2860 wifi driver locking
> > the box on resume from suspend.  I was so satisfied with being able to at
> > last put my machine to rest at will, and it so extended it's usability that
> > decided to get more aggressive and re-enable the "Super Hybrid Engine"
> > feature.
> [snip; freeze while on mains]
> > I booted it up and noticed that it wouldn't boot all the way, and froze
> > where it used to freeze when I had first noticed the "S.H.E." problem
> > months ago, prior to disabling that feature in the BIOS (Advanced-> CPU
> > Config-> Intel Speed Step tech).
> 
> Hmm? Speedstep != S.H.E.
> 

I made the connection because disabling/enabling this in BIOS effects the
behaviour... I'll dig a little more through logs to see if the line is 
truly missing when BIOS setting for Speedstep is disabled...

> [snip]
> > Has anyone else seen this issue?
> 
> Some 700-series users. Never before a 901 user or, for that matter, any user
> of _any_ Atom-based model (that I know of); my 901's certainly never shown a
> problem.
> 
> OOI, which BIOS version? (I'm using 2103.)

it's ASUS 901 ACPI BIOS Revision 1703

> 
> Your kernel configuration may also be relevant.
> 
> [snip]

Also - I double checked and the boot message:
"Setting super hybrid engine according to configuration... (Battery) ... done"
or (AC), appears regardless of the BIOS setting, but flipping the 
"Intel Speed Step Tech" definitely triggers the behavior ...

I can survive w/o this feature, but it was nice to think i was increasing 
effeciency, and I use iceWM, in which all of a sudden the CPU performance
indicator started showing something other than 0.000 GHZ CPU Freq, and would
show the expectd values ( 0.800 GHz, 1.600, 1.333 etc)... I finally felt I had
"gotten there" after switching from the default Xandros it shipped with ...

Shawn


-- 
Shawn Lamson
shawn.lamson at gmail.com