Power management

[Julien Cigar]

On Thu, Nov 29, 2018 at 06:36:46AM -0500, Ken M wrote:
> 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?

try to add:

in /boot/loader.conf:
acpi_video_load="YES"

in /etc/sysctl.conf:
hw.acpi.video.lcd0.brightness=50

> 
> Thank you,
> Ken
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-- 
Julien Cigar
Belgian Biodiversity Platform (http://www.biodiversity.be)
PGP fingerprint: EEF9 F697 4B68 D275 7B11  6A25 B2BB 3710 A204 23C0
No trees were killed in the creation of this message.
However, many electrons were terribly inconvenienced.
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