= System Wide Change: Improved Laptop Battery Life = https://fedoraproject.org/wiki/Changes/ImprovedLaptopBatteryLife Change owner(s): * Hans de Goede <hdegoede AT redhat DOT com > Improve Fedora (Workstation) Battery Life by enabling various hardware power-saving features by default. == Detailed Description == The initial focus of this change is to enable to following 3 hardware power-saving features by default: * A new SATA link-powermanagement-policy has been written which mirrors Windows defaults: med_power_with_dipm, this has been merged for kernel 4.15, as part of this change this new policy will be the default on all Intel mobile chipsets. This saves aprox. 1.0 - 1.5 Watts of power on an idle laptop. * Enable Intel HDA codec power-saving by default with a 1 second timeout. This saves aprox. 0.4 Watts of power on an idle laptop. * Enable USB autosuspend for USB bluetooth receivers by default. If all other USB devices on the laptop also have USB auto-suspend enabled (which typically is true) this saves aprox. 0.4 Watts of power on an idle laptop. Depending on how much time this takes, this list may be extended. == Scope == * Proposal owners: Write kernel patches adding new policies / setting the defaults where necessary and merge these upstream (done for the new SATA link-pm-policy and for allowing USB autosuspend for btusb), temporarily add these patches to the Fedora kernels where necessary and set the Kconfig options to enable these features by default. * Other developers: This should not impact other developers, but e.g. developers working on bluetooth may see regressions which have their root cause in this change. All the changes will have kernel cmdline options to disable them, so that developers can easily ask users to test if these changes are the cause of any problems. * Release engineering: https://pagure.io/releng/issue/7171 * Policies and guidelines: The policies and guidelines do not need to be updated. * Trademark approval: Not needed for this Change. -- Jan Kuřík Platform & Fedora Program Manager Red Hat Czech s.r.o., Purkynova 99/71, 612 45 Brno, Czech Republic _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
