There's also tuned, another way to set lots of kernel bits. I think it was an accepted feature for a previous Fedora release, but it's off by default, and it is only mentioned in the Fedora 20 power saving guide, which seems to have disappeared entirely for Fedora 21+: https://docs.fedoraproject.org/en-US/Fedora/20/html/Power_Management_Guide/tuned.html It would be really nice to have something on by default. I certainly don't want to go through the laundry list of tunables and profiles every time I install a Fedora system. The big thing that has prevented this previously, as I understand, is the possibility to expose power management bugs, breaking things for some users. In my experience some of the powertop settings make quite a big difference. Out of the box on my haswell laptop, Fedora never enters any package state lower than C2. Just turning on SATA link power management, for example, allows it to enter C3 and saves a few watts. On 04/07/2017 03:47 PM, Chris Murphy wrote: > 01.org has several projects related to power management, but most > aren't in Fedora repositories. Are any of these useful for the recent > effort to make power management better on Fedora? > > I've been compiling thermald from source for a while, and it does make > a difference to battery life and heat generation on laptops. It's only > in copr and that version is old. > > The description of thermal daemon: > "This is an active open source project distributed under the LGPL open > source license. With a mature and established codebase containing > about 12,000 lines of code. > > Linux Therman Daemon is currently used in distributions such as Ubuntu > and Fedora and can be used any Linux-based system, including Chromium, > Chrome OS or Android." > > Except it's not used in Fedora. Intel is the maintainer upstream. > Seems like a strong candidate for default installation and activation > on Fedora Workstation. > > Next up is Powertop, which I've used off and on mostly for diagnostic. > But it also has some startup time optimizations applied with a systemd > unit. *shrug* I can't quantify how useful those optimizations are. The > one in Fedora right now is the previous version which doesn't work on > Skylake or Kabylake CPUs. > > RAPL Power Meter I've never used. > > suspendresume I hadn't even heard of until looking at this page just > now, but the description sounds like it'd useful for both workstation > and server products. > > "The use of Suspend/Resume is an excellent way to save power in Linux > platforms, whether in Intel® based mobile devices or large-scale > server farms. Optimizing the performance of suspend/resume has become > extremely important because the more time spent entering and exiting > low power modes, the less the system can be in use." > > > _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
