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Rationale: human readable time does not account for suspend/resume and is way off afterwards. See man dmesg.
TLP README - 05.08.2015 TLP brings you the benefits of advanced power management for Linux without the need to understand every technical detail. TLP comes with a default configuration already optimized for battery life, so you may just install and forget it. Nevertheless TLP is highly customizable to fulfil your specific requirements. TLP is a pure command line tool with automated background tasks. It does not contain a GUI. Separate settings profiles depending on the power source AC/battery: - Kernel laptop mode and dirty buffer params - Processor frequency scaling including "turbo boost" / "turbo core" - Limit max/min P-state to control power dissipation of the CPU - intel_pstate only - Power aware process scheduler for multi-core/hyper-threading - Processor performance versus energy savings policy (x86_energy_perf_policy) - Hard disk advanced power magement level and spin down timeout (per disk) - SATA aggressive link power management (ALPM) - PCIe active state power management (PCIe ASPM) - Kernel 2.6.35 and above - Runtime power management for PCI(e) bus devices - Kernel 2.6.35 and above - Radeon graphics KMS power management - Kernel 2.6.35 and above, not fglrx - Radeon graphics dynamic power management - Kernel 3.11 and above, not fglrx - Wifi power saving mode - depending on kernel/driver - Enable/disable integrated radio devices (excluding connected devices) - Power off optical drive in UltraBay/MediaBay (on battery) - Audio power saving mode - hda_intel, ac97 Additional functions: - I/O scheduler (per disk) - X86 energy perf policy - USB autosuspend with device blacklist/whitelist (input devices excluded automatically) - Enable or disable integrated radio devices upon system startup and shutdown - Restore radio device state on system startup (from previous shutdown) - Radio device wizard: switch radios upon network connect/disconnect and dock/undock - Disable Wake On LAN - Integrated WWAN and bluetooth state is restored after suspend/hibernate - Untervolting of Intel processors - requires kernel with PHC-Patch - Battery charge thresholds - ThinkPads only - Recalibrate battery - ThinkPads only All TLP settings are stored in /etc/default/tlp. The default configuration provides optimized power saving out of the box. Read the the full documentation at: - http://linrunner.de/tlp Or take a look at the manpages: - tlp - tlp-stat (display tlp status and active settings) - wifi, bluetooth, wwan (switch wireless devices on/off) - run-on-ac, run-on-bat