[gentoo-laptop] Dell Inspiron boot on battery slowness

[gentoo-laptop] Dell Inspiron boot on battery slowness

[Will Briggs]

G'day all,

Having an interesting phenomenon when I boot my Dell Inspiron 6400 to
linux without AC plugged in.  The boot process is as slow as a dog, all
the fans are maxed "on", and cpufrequency shifting gets stuck at 1 GHz
like the governor is not working (and the slowness is more than what the
cpu frequency shifting would cause).

However if I boot with AC and then unplug it everything works well under
battery - cpu steps up and down with demand, fans behave properly etc.

I wondered at first if the BIOS switches stuff off under battery so that
various modules don't load or something but there's nothing obvious in
dmesg and lsmod looks fine - and I've check out BIOS settings to see if
there's anything - and there isn't.

Any clue where to begin diagnosing such an issue?

W.
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Re: [gentoo-laptop] Dell Inspiron boot on battery slowness

[Andrew Randles]

I don't have much to add but I have the same problem with my TP T42.
If I boot without ac and check the the cpuinfo it will say it is
running at full speed (1.8 Ghz).  It feels like 600 Mhz or slower from
some compile tests I have done.

If anyone has a suggestion I would love to hear it.

Andrew

On 8/11/06, Will Briggs <will@burnieanglican.org.au> wrote:
> G'day all,
>
> Having an interesting phenomenon when I boot my Dell Inspiron 6400 to
> linux without AC plugged in.  The boot process is as slow as a dog, all
> the fans are maxed "on", and cpufrequency shifting gets stuck at 1 GHz
> like the governor is not working (and the slowness is more than what the
> cpu frequency shifting would cause).
>
> However if I boot with AC and then unplug it everything works well under
> battery - cpu steps up and down with demand, fans behave properly etc.
>
> I wondered at first if the BIOS switches stuff off under battery so that
> various modules don't load or something but there's nothing obvious in
> dmesg and lsmod looks fine - and I've check out BIOS settings to see if
> there's anything - and there isn't.
>
> Any clue where to begin diagnosing such an issue?
>
> W.
> --
> gentoo-laptop@gentoo.org mailing list
>
>
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gentoo-laptop@gentoo.org mailing list

Re: [gentoo-laptop] Dell Inspiron boot on battery slowness

[Alexander Jerneck]

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Hi,

Perhaps you already checked for this but my uneducated guess on this is that
it has to do with buggy ACPI. Check out http://gentoo-wiki.com/ACPI for
example.

Alexander


On 8/11/06, Andrew Randles <ehud42@gmail.com> wrote:
>
> I don't have much to add but I have the same problem with my TP T42.
> If I boot without ac and check the the cpuinfo it will say it is
> running at full speed (1.8 Ghz).  It feels like 600 Mhz or slower from
> some compile tests I have done.
>
> If anyone has a suggestion I would love to hear it.
>
> Andrew
>
> On 8/11/06, Will Briggs <will@burnieanglican.org.au> wrote:
> > G'day all,
> >
> > Having an interesting phenomenon when I boot my Dell Inspiron 6400 to
> > linux without AC plugged in.  The boot process is as slow as a dog, all
> > the fans are maxed "on", and cpufrequency shifting gets stuck at 1 GHz
> > like the governor is not working (and the slowness is more than what the
> > cpu frequency shifting would cause).
> >
> > However if I boot with AC and then unplug it everything works well under
> > battery - cpu steps up and down with demand, fans behave properly etc.
> >
> > I wondered at first if the BIOS switches stuff off under battery so that
> > various modules don't load or something but there's nothing obvious in
> > dmesg and lsmod looks fine - and I've check out BIOS settings to see if
> > there's anything - and there isn't.
> >
> > Any clue where to begin diagnosing such an issue?
> >
> > W.
> > --
> > gentoo-laptop@gentoo.org mailing list
> >
> >
> --
> gentoo-laptop@gentoo.org mailing list
>
>


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