[ltp] T41 cpufreqd issue

[Alexander Gran]

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Hi,

actually cou cannot got as low as 200Mhz, the cpu would not run stable.
There are two possiblilities to go below the 600Mhz:
Throthelling states. You can do up to 87% throthelling, that would be 78Mhz=
=20
usable. However the cpu is still at 600Mhz, its just do nohting 87% of the=
=20
time. The other possiblity is C3. This only works with ACPI and X disabled=
=20
(or after a suspend/reusme cyle, nonoe seems to know why). Busmaster=20
conflicts here and there with C3, several drivers don't get it right. But=20
ACPI doesn't really work anyway..The kernel reports the slower CPU speeds=20
also seen under Windows that.

regads
Alex

Am Dienstag, 11. Mai 2004 09:15 schrieb Konstantin:
> hi,
>
>
> Your Problem ist the Kernel, you have to choose at least 2.4.24 for better
> cpufreqd support. But the best decision would be to use the newest 2.6
> kernel(2.6.6 since 2 days out). The new Kernel has the best support for A=
PM
> and cpufreqd especially. ACPI doesn't work under linux on thinkpad, blame
> IBM for this(yes they are work arounds in the kernel for bad IBM bios and
> other). I've seen a lot of Fujitsu-Siemens, Acer, Samsung, HP and other
> running ACPI with almost all ACPI features.
>
> I only use the cpufreqd driver for the pentium-m and powernowd(my
> favourite). With this combination I run best. To take the cpu to 200Mhz
> down makes no sense, because there is no powersave under the lowest cpu
> frequenz, which is given by intel. Lower Mhz will only slow down your
> system and have no sense at all.
>
> But this are only my 2 cent to this discussion ...
>
> Greetz
>
> Konstantin
>
>
>
> On Tue, 11 May 2004 01:17:26 -0500
>
> Dan Borello <dborello@uiuc.edu> wrote:
> > I don't think you are doing anything wrong.  I believe that
> > the lowest that it can be set is 600mhz, at least for me.  I
> > wasn't aware that windows puts it at 200, which may explain
> > the better battery life.
> >
> > dan
> >
> > ---- Original message ----
> >
> > >Date: Tue, 11 May 2004 01:34:21 -0400
> > >From: "Lance A. Brown" <lance@bearcircle.net>
> > >Subject: [ltp] T41 cpufreqd issue
> > >To: linux-thinkpad@linux-thinkpad.org
> > >
> > >Greetings,
> > >
> > >I have Fedora Core 1 with kernel 2.4.22-1.2188.nptl running
> >
> > on an IBM
> >
> > >T41 (2378-EPU).  I'm trying to use cpufreqd to throttle the
> >
> > CPU when I'm
> >
> > >running on the batter but cannot seem to convince it to put
> >
> > either the
> >
> > >minimum or maximum CPU frequency below 35%.
> > >
> > >I've seen the CPU freq down near 200Mhz under WindowsXPPro so
> >
> > I should
> >
> > >be able to get down to that kind of speed under linux, no?
> > >
> > >
> > >[root@cub 0]# echo '0%15%15%powersave' > /proc/cpufreq
> > >[root@cub 0]# cat /proc/cpufreq
> > >          minimum CPU frequency  -  maximum CPU frequency  -
> >
> >  policy
> >
> > >CPU  0       600000 kHz ( 35 %)  -     600000 kHz ( 35 %)  -
> >
> >  powersave
> >
> > >Am I doing something wrong?
> > >
> > >--[Lance]
> > >
> > >--
> > > Carolina Spirit Quest  http://www.carolinaspiritquest.org/
> > > Celebrate The Circle   http://www.celebratethecircle.org/
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> >
> > 69AC 07B9
> >
> > >--
> > >The linux-thinkpad mailing list home page is at:
> > >http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
> >
> > --
> > The linux-thinkpad mailing list home page is at:
> > http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>
> --
> --
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