FreeBSD is a great operating system imo, although I’m still fine tuning my setup and sharpening knives. I notice every time I turn on my computer to work I spend at least 15-20 seconds increasing the brightness before working no matter what. The steps I use to increase the brightness:

loading kernel modules requires privilege escalation (and typing a password)

su

load the acpi_video driver into the kernel using kldload

kldload acpi_video

Loading the driver every time was cumbersome, and while it seemed like it should be straight forward to load the module at boot, adjusting the brightness took a bit of searching and experimentation. First, I added the following to /boot/loader.conf which will provide the driver during the boot process.

acpi_video_load="YES"

Lastly, there are two knobs for setting the brightness depending on if the computer is plugged in or running on bats. For myself I just set these both to 100 since that seems to be my default (volume 11/10). To adjust these settings, I add the following to /etc/sysctl.conf:

hw.acpi.video.lcd0.economy=100
hw.acpi.video.lcd0.fullpower=100

While experimenting with different boot configurations I timed the time it takes to boot on this Thinkpad T480s, and currently it clocks in at around 1 minute. There are some things I could remove from the boot process I think like sendmail which I don’t use but that’s a post for a different day.