[ltp] Which Thinkpad to get

[Thomas Breitner]

Hi,

don't know if this fits your issue...

i've had some issues/questions regarding pIII-speedstep with my last
(inspiron 8100) laptop. 

here the answers from Mattia Dongili (the whole thread is available at
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=%23253299 ):


ok, having some conversation with the cpufreq-people, here's the story
and the solution:

1. the speedstep-ich-driver doesn't work on dell inspiron 8?00 laptops
(which is also mentioned in
arch/i386/kernel/cpu/cpufreq/speedstep-ich.c), because it's a very - too
- early revision of the chipset.

2. the speedstep-smi-driver is a "second-best" solution, it works by
telling the bios to switch the frequency, which can be slow (--> here
ist where my problem "little system hang" occurs)

3. another solution - for me and my inspiron 8100 the
"first-best"-solution:
using the cpufreq-acpi-driver

--- kernel-2.6.6-config:
# CPUFreq processor drivers
#
CONFIG_X86_ACPI_CPUFREQ=m
---

with this configuration the switching works flawless.
so you might check the revision of your chipset...

greetings,
thomas



Am Dienstag, den 04.10.2005, 18:49 +0200 schrieb Javier (a.k.a AlBundy):
> On 10/2/05, Tino Keitel <tino.keitel@gmx.de> wrote:
> > > IIRC,
> > > -T20/21/22 have PC100 RAM & PIII with basic SpeedStep
> > > -T23 has PC133 RAM & PIII with Advanced SpeedStep
> >
> > What are the differences bethween these types of SpeedStep?
> 
> I am not sure.
> 
> My opinion:
> 
> with (standard) SpeedStep,
> --when the notebook is connected to AC, it can only run into "maximum
> perfomance mode" only.
> --when notebook is powered by a battery, it can run in both "maxim
> perfomance mode" and "power conservation mode". You can force a
> particular mode with a software program.
> 
> 
> with Advanced SpeedStep, notebook can run in both "maxim perfomance
> mode" and "power conservation mode", when powered by battery, and when
> powered by AC too.
> You can force a particular mode with a software program.
> 
> 
> Can anybody (with a T20, T21 or T22) confirm this, please?.
> 
> 
> PS:
> In my T23, it's true: you can select mode with battery and with AC.
-- 
_____________________________________________
Thomas Breitner

mail@tombreit.de   |   http://www.tombreit.de