[linux-pm] PowerOp Design and working patch

Vitaly Wool vitalywool at gmail.com
Tue Aug 1 12:17:47 PDT 2006


> > Would not the normal Unix permissions system prevent the
> > "bad state" problem, in the non-embedded case?
>
> Not necessarily, the problem occurs when the user (root even)
> passes in a frequency or voltage that isn't quite supported.  The value
> passes the ranges checks but when the clocks are set to the passed
> value the voltage is just below the edge where things still work. The
> system gets into an undefined state and usually hangs.  This is the
> most common problem we have today with the Dynamic Power
> Management solution.

Oops.
That's the problem of *BAD* restrictions, and not of the approach.

Vitaly



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