[ltp] WARNING: Lenovo ThinkPads and 65W power supplies

[Henrique de Moraes Holschuh]

On Mon, 08 Nov 2010, Eric Van Buggenhaut wrote:
> 2010/11/5, Henrique de Moraes Holschuh <hmh@hmh.eng.br>:
> > If your usage patterns does include the use of a 65W power adapter
> > *WITHOUT* a charged battery:
> >
> >   1.  Use the latest Linux stable kernels, as there were recent fixes
> >       to the ACPI PPC handling;
> >
> >   2.  Make sure the CPUFREQ system is working (i.e. cpu frequency limits
> >       are available), ACPI is operational (NEVER operate any ThinkPad
> >       manufactured in the last 5 years with ACPI deactivated), and if
> >       at all possible, that CPUIDLE (ACPI C states) are also working.
> >       "powertop" will show both CPUFREQ and CPUIDLE operation.
> 
> I don't see any CPUFREQ/CPUIDLE operation in powertop

C-state changes are governed by cpuidle.  Processor frequency changes are
governed by cpufreq.  PowerTop shows both.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh