Display brightness

Don't know about that particular notebook, but if you cannot change it when FreeBSD is running, you could maybe change it during BIOS phase.
Not optional solution, I know, but one possibility if nothing else works...

Other things to try, if acpi does not support it out of the box:
-load acpi_video
- xbrightness
- xbacklight
- xrandr --brightness

Maybe someone else (or google) knows some more...
 
Secondary solution will not work in console. It is important for me, cause I sit there a lot of time.
I did try kldload acpi_video. Should it work in Live CD?
 
I've just discover how it can be done in Ubuntu. There is no similar way for freebsdFreeBSD?
rc.local:
Code: 
echo 256 > /sys/class/backlight/intel_backlight/brightness
 
If your laptop supports it, try setting sysctl hw.acpi.video.lcd0.brightness=<value> after you kldload acpi_video.
 
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