Question Can't Turn Up & Down Laptop Display Brightness

[System32_76]

As the title says.

I'm running Linux Mint 19.3 Cinnamon with Nvidia Geforce 9400GM drivers.
Is this a driver issue at all?

 

[Bassplate]

Have you tried using the function keys to adjust you brightness for the screen?

Use the function keys(Showed in the image )And adjust your brightness.Your keyboard may be different but hold the FN key and look and press the (adjust upper or downer key for your screens brightness)
Hope this helps

 

[System32_76]

Have you tried using the function keys to adjust you brightness for the screen?

Use the function keys(Showed in the image )And adjust your brightness.Your keyboard may be different but hold the FN key and look and press the (adjust upper or downer key for your screens brightness)
Hope this helps

I have, but they don't work. The only thing I can turn up and down with my function keys is the keyboard brightness.

 

[Bassplate]

Nvidia Geforce 9400GM

You said you have Nvidia Drivers installed...Have you tried opening Nvidia Control panel and Adjusting your Brightness From there.Right click on Desktop and say open Nvidia Control Panel.
Here is a Other Helpful link that can help you solve this Problem.
View Link here=https://support.microsoft.com/en-us/help/4026946/windows-10-change-screen-brightness

 

[System32_76]

You said you have Nvidia Drivers installed...Have you tried opening Nvidia Control panel and Adjusting your Brightness From there.Right click on Desktop and say open Nvidia Control Panel.
Here is a Other Helpful link that can help you solve this Problem.
View Link here=https://support.microsoft.com/en-us/help/4026946/windows-10-change-screen-brightness

That's for Windows 10. I'm running Linux Mint 19, so this isn't applicable.

 

[System32_76]

I'm running Linux Mint 19.3 Cinnamon on a 2009 Macbook Pro
with Nvidia Geforce 9400GM drivers. Is this a driver issue at all?

The only thing the Power Manager is recognizing concerning brightness is the laptop keyboard (Macbook feature), not the actual display.

According to this article about this issue, I started with method 4 up to 4.3. No success.
https://easylinuxtipsproject.blogspot.com/p/display.html#ID4.2