[Lancaster] Laptop Power Managment

[Martyn Welch]

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Hi Ken,

I have briefly looked at this topic.

1. As far as I know APM is an older technology, ACPI is probably the way to 
go. ACPI is probably more likely to get updated over time.

2. Power management especially in laptops is still quite a new feature and is 
also something which varies massively from machine to machine. It maybe that 
the drivers are not fully compatible with the T21's power management features 
(yet).

It might be worth trying to update the kernel to the newest, if it hasn't 
already been, to see if any new features help...

Martyn

- ------ Original message ------
On Tuesday 29 Jun 2004 17:47, Ken Hough wrote:

> Is there anybody out there who is familiar with battery/power management
> on laptop PCs and in particular APM/ACPI?
>
> I'm new to this. I've recently got an IBM Thinkpad T21 and am running
> SuSE v9.1. The SuSE Manual does cover APM and ACPI to some extent, but I
> would appreciate help on the following:
>
> 1. The pros, cons of APM and ACPI. I have run with APM and then with
> ACPI. Can do this by boot instructions 'apm=on/off' and 'acpi=on/off'. I
> get appropriate info and directories under /proc, so both seem to work.
>
> 2. The battery in the T21 is rated at 38800mWHr, but under acpi, 'cat
> /proc/battery/BAT0/state' always reports a full charge of only
> 17600mWHr. It's not a new battery, but the fact it always reports
> exactly 17600 seems suspicious to me.
>
> I will bring this laptop with me to the Folly tomorrow evening (ie
> Wednesday 30th June)
>
>
> Ken Hough
>
>
>
> _______________________________________________
> Lancaster mailing list
> Lancaster at mailman.lug.org.uk
> http://mailman.lug.org.uk/mailman/listinfo/lancaster

- -- 
Martyn Welch (welchm at comp.lancs.ac.uk)

PGP Key : http://ubicomp.lancs.ac.uk/~martyn/pgpkey.html
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