Matthew Garrett <mgarr...@chiark.greenend.org.uk> writes: > powertop makes various recommendations that are only useful in very > specific circumstances. Disabling polling in hal saves you a small (and > probably not useful in the real world) amount of power, but is required > to get to the number of wakeups per second that Arjan was aiming for. I > haven't been able to measure any difference in power consumption on a > typical system.
I'm sure you know this, but others may not be aware of it... Modern systems have the ability to put inactive devices in a low power state to save power. See for example http://www.lesswatts.org/projects/devices-power-management/ You'll save between 0.5 and 1.5 W by enabling SATA Aggressive Link Power Management according to http://www.lesswatts.org/tips/disks.php As this definitely is measurable, I assume that your measurements have been done without enabling ALPM? Or maybe the power saving estimated by lesswatts is based on normal hard drive usage? Could you please share the details of what you've measured? Which type of drives, controllers and drivers are used in a "typical system"? How about a "typical laptop" (which in my world is the only system class where this matters anyway)? How about "modern laptop" (AHCI controller, SATA DVD)? Bjørn -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
