Difference between revisions of "How to make use of Power Management features"

From ThinkWiki
Jump to: navigation, search
(APM vs. ACPI)
Line 7: Line 7:
 
On older models you are surely better off with APM, if they feature ACPI at all.
 
On older models you are surely better off with APM, if they feature ACPI at all.
  
It seems that at least in all models from the A, G, R, T and X series ACPI generally works fine and is a lot more flexible than APM, but with a lot of them also a [[Problem with high power drain in ACPI sleep]] has been experienced.
+
It seems that at least in recent models from the A, G, R, T and X series ACPI generally works fine and is a lot more flexible than APM, but with a lot of them also a [[Problem with high power drain in ACPI sleep]] has been experienced.
 +
 
 +
Please check our [[APM vs. ACPI | APM vs. ACPI success table]] to find out about APM and ACPI support in specific models.
  
 
On the other hand simply switching from APM to ACPI extended my X31 battery runtime from about 3.5h to 4h. This had
 
On the other hand simply switching from APM to ACPI extended my X31 battery runtime from about 3.5h to 4h. This had

Revision as of 11:19, 13 March 2005

General Information about Power Management features

This page should give you all the information you need to make use of your ThinkPads Power Management features under Linux and hence effectively enhance your battery life.

APM vs. ACPI

All ThinkPads support APM and a lot support ACPI as well, but at different qualities of implementation. Both technologies cannot be used simultaneously. So you'll have to make a choice which would depend very much on the model as well as on the state of ACPI support in the kernel.

On older models you are surely better off with APM, if they feature ACPI at all.

It seems that at least in recent models from the A, G, R, T and X series ACPI generally works fine and is a lot more flexible than APM, but with a lot of them also a Problem with high power drain in ACPI sleep has been experienced.

Please check our APM vs. ACPI success table to find out about APM and ACPI support in specific models.

On the other hand simply switching from APM to ACPI extended my X31 battery runtime from about 3.5h to 4h. This had nothing to do with Dynamic Frequency Scaling which was active in both configurations.

>(TODO: more precise and extended info should be provided here)<

How to enable certain features

The following links will take you to separate pages dealing with the various topics.