Date: Thu, 29 Nov 2018 06:36:46 -0500 From: Ken M <ken@mack-z.com> To: freebsd-questions@freebsd.org Subject: Power management Message-ID: <20181129113646.GA45451@ultron>
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Recently returning as a freebsd desktop/laptop user. I have a thinkpad t440 that previously ran openbsd and now has freebsd 11.2 on it. I am noticing that it seems freebsd is consuming the battery slightly faster. Granted that could easily be explained by perhaps usage. However one thing I cannot seem to dig up is setting a defauly boot brightness. Now the t440 brightness keys work just fine. In fact no tweaks needed. So I am guessing it is a bios function. I was thinking a sysctl setting would do it but case in point. sysctl hw.acpi hw.acpi.acline: 0 hw.acpi.battery.info_expire: 5 hw.acpi.battery.units: 2 hw.acpi.battery.state: 1 hw.acpi.battery.time: 267 hw.acpi.battery.life: 96 hw.acpi.thermal.tz0._TSP: -1 hw.acpi.thermal.tz0._TC2: -1 hw.acpi.thermal.tz0._TC1: -1 hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 hw.acpi.thermal.tz0._CRT: -1 hw.acpi.thermal.tz0._HOT: -1 hw.acpi.thermal.tz0._PSV: -1 hw.acpi.thermal.tz0.thermal_flags: 0 hw.acpi.thermal.tz0.passive_cooling: 0 hw.acpi.thermal.tz0.active: -1 hw.acpi.thermal.tz0.temperature: 36.1C hw.acpi.thermal.user_override: 0 hw.acpi.thermal.polling_rate: 10 hw.acpi.thermal.min_runtime: 0 hw.acpi.cpu.cx_lowest: C8 hw.acpi.reset_video: 0 hw.acpi.handle_reboot: 1 hw.acpi.disable_on_reboot: 0 hw.acpi.verbose: 0 hw.acpi.s4bios: 0 hw.acpi.sleep_delay: 1 hw.acpi.suspend_state: S3 hw.acpi.standby_state: NONE hw.acpi.lid_switch_state: S3 hw.acpi.sleep_button_state: S3 hw.acpi.power_button_state: S5 hw.acpi.supported_sleep_state: S3 S4 S5 No brightness settings there. On a whim I thought I would see what xbacklight could do for me. xbacklight -get No outputs have backlight property So I guess the long and short of my question is what would be the correct way to set the brightness at boot? And also is there perhaps any other tweaks I could make to improve battery life? Thank you, Ken
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