On Fri, 25 Jun 2010 23:44:22 -0500, Victor Lowther <victor.lowther@xxxxxxxxx> wrote: > The latest release of pm-utils (1.4.0) added some default hooks for > helping conserve power. Based on the recent thread on linux-pm > proposing a /sys/power/policy_preference knob, I decided to implement > support for setting powersave profiles in pm-utils. From the git > logs: > I'm really confused. This seems like the polar opposite of the direction we have been saying we should be taking. The argument has been strongly made (Matthew Garrett comes to mind, but there are no doubt others) in the past that the concept of a power profile is fundamentally broken. Instead we should _always_ be trying to save power. Thankfully there are only very few cases where saving power and delivering good performance are at stake. In general, the faster we can get our work done, the longer we can remain in low-power states. Moreover, hardware is only getting better at saving power while minimally affecting operation. Thus, I pose the question: do we really want this sort of explicit control in the user-space? Even if we do, I far from convinced that the policy_preference model is a sound way to expose this preference to the user. The 5 levels as layed out in the proposal seem awfully arbitrary and really don't express the full gamut of preferences that a user might hold. - Ben _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
