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how to dim my screen ? linux mint 19.2 MATE

can anybody tell me how to adjust screen brightness ?
the linuxmint screen brightness in power management option is just not available in mine.
i don't want to upgrade to the latest version as, i rather use older 1 version due to stability issue.
thanx
andrew

Distro: Linux Mint 19.2 Tina
Desktop: MATE 1.22.0
Kernel: 4.15.0-54-generic x86_64
base: Ubuntu 18.04 bionic
Shell: bash v: 4.4.20

I tend to use the brightness controls on my monitors to do this, (+) and (-) buttons. Maybe this isn't what you mean though...

Play Bonny!

:hattip:

Let’s see if this is still possible from the command line!
Try the following:

Code:

sudo su -

cd /sys/class/backlight

Now it depends a little on your hardware, but there should be exactly one subfolder (for one monitor), and inside that subfolder should be a file called ‘brightness’
So, cd to that subfolder (on my system it’s intel_backlight):

Code:

cd intel_backlight

cat brightness

echo 100 > brightness

echo 500 > brightness

etc.
I think the values are hardware-specific but on my machine 100% brightness is 800.
Don't use too small values, öest the screen goes dark!