Hello. I've been trying to disable auto-dimming on Zorin OS 17. I've gone through all settings and can't find any that turn it off. I also followed the advice given in this thread:
Any help with this would be nice!
When You go to Settings>Power/Energy what Power Profile is active?
When I enter settings for power it is on 'balanced' mode
You can use a terminal command to set the idle-brightness to a custom value. If you don't like dimming set it to 100 [%].
gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 100
You can also use dconf-editor to do this
sudo apt install dconf-editor
and then go to org> gnome > settings-daemon > plugins > power > idle-brightness
Maybe it also helps to disable "ambient-enabled" at the same power settings page.
When I enter the command it says there's no schema for
org.gnome.settings-deamon.plugins.power
I have the gnome extension, is there a different version of it that would allow me to change auto-dimming?
Did you write deamon or daemon? When there is a typo or there are too many . between the words it doesn't work.
Or are you on Zorin lite? Your profile is hidden so we can't see which OS you use.
I'm on pro. I retyped into the terminal and it accepted both idle-brightness 100 and idle-brightness false, but there's no change.
The problem is that whenever there's black spots, or darker colors on the screen, it automatically lowers the brightness. It happens for anything; videos, loading screens, pictures etc. it also darkens to the point that it's incredibly hard to see whatever is on screen. I know it isn't a problem with the monitor, as before it never did this prior to using Zorin, and is pretty old so it doesn't have any settings like auto-dimming.
And it did not help to set the ambient light sensor to off?
gsettings set org.gnome.settings-daemon.plugins.power ambient-enabled false
Logout and login again.
I read about this problem in Linux on old monitors, but haven't found a solution. If you have settings in your monitor for DCR or HDR you could try to play with them (enable/disable) for testing.
That sound for me more like a Thing of the Display itself to be honest. Is this a Monitor or the Display of a Laptop?
I'm using an old (not super old, but abt 10~ years old) samsung smart TV for the monitor. I've already gone through all of its settings, disabling and enabling things to no avail. I also didn't have this problem with the monitor before I switched to Zorin.
I've put in the command and reset a couple of times but there's been no change. I've run:
gsettings set org.gnome.settings-daemon.plugins.power ambient-enabled false
gsettings set org.gnome.settings-daemon.plugins.power idle-brightness false
gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 100
gsettings set org.gnome.settings-daemon.plugins.power idle-dim false
gsettings set org.gnome.settings-daemon.plugins.power idle-dimming false
As well as variations with setting them to 0, 100, or false. I tested to see if these worked before and after restarting but there's been no change.
It may help to use the following guide to turn off autodim at Samsung monitors:
https://www.retrospace.net/infoseiten/readm.php?id=146
But I'm not an expert and I'm not sure whether it's worth trying for you.
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This worked! Thank you so much, I've been trying to fix this for so long and thought i'd done all of the TV tricks. I can now see much better and there's no more darkening!!! Have a wonderful new year, and thank you again!! 
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You're welcome, thank you! A happy new year to you too! I'm glad it helped you solve the problem. That was a very hidden setting.
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