I just installed FreeBSD 13.1 AMD64 on a laptop with an Intel CPU and Intel GMA integrated graphics. I cannot change the backlight on the LCD no matter what I try.
I first tried to load acpi_video using
Then I tried
Then I installed
After that, I tried installing xbacklight. executing xbacklight always returns me the error "RANDR Query Version returned error -1" outside of Xorg. Using the xbacklight command in Xorg (more specifically Xfce that I'm currently using.), the message "No outputs have backlight property" is returned.
Well, that's everything I tried. Don't know any other possible solution. Thank you in advance for helping me!
I first tried to load acpi_video using
kldload acpi_video
which did not post any error messages. However, it still wouldn't let me change the brightness with the appropriate keys on the keyboard (Not even while holding down the Fn key). Then I tried
sysctl hw.acpi.video.lcd.active
along with all the other commands starting with sysctl hw.acpi.video.lcd (.levels, .brightness, .fullpower and .economy). All of them resulted in sysctl telling me "sysctl: unknown oid '<inputted oid>'"Then I installed
pkg install graphics/intel-backlight
. After installation, I tried running any and all commands beginning with backlight but everytime I would receive the error: "backlight: cannot open /dev/backlight/backlight0: No such file or directory" After that, I tried installing xbacklight. executing xbacklight always returns me the error "RANDR Query Version returned error -1" outside of Xorg. Using the xbacklight command in Xorg (more specifically Xfce that I'm currently using.), the message "No outputs have backlight property" is returned.
Well, that's everything I tried. Don't know any other possible solution. Thank you in advance for helping me!