SATA Aggressive Link Power Management (ALPM) - call for testing

Amit Kucheria amit.kucheria at
Sun Dec 18 10:07:12 UTC 2011

On 11 Dec 06, Colin King wrote:
> The backlight issue makes me also think about other non-obvious
> settings. For example, with framebuffer compression we use less
> power to clock out the image, so I'd like to measure a default
> desktop background vs a plain background vs a complex background
> image.
> And also I will be investigating the white vs black pixels setting
> when the screen is blanked - apparently white saves power.

Are laptops seeing OLED/AMOLED displays like phones these days? If so, white
backgrounds will kill battery life.

> If any one has any further ideas, let me know.

Is Bluetooth on your list of things to silence? It might save a watt by

There are some other experimental techniques around sched_mc and hotplug that
are being used by ARM vendors but might not be suitable for a LTS release.


Amit Kucheria, Power Management Tech Lead, Linaro || amit.kucheria at

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