[SOLVED] Brightness not working after switching to Nvidia driver

[Spectrum75]

Use this command and post the output: ls /sys/class/backlight/*/*

ls: cannot access '/sys/class/backlight/*/*': No such file or directory
This is the output I get, have tried with sudo, non-root and su but the same thing.

[Spectrum75]

I tried removing xbacklight, but then too that applet isn't able to control brightness

Is that applet the one which also has power management?

No, its not that applet its another one, which has options for only brightness, gamma value etc.

[roblm]

What is the output of this command: ls /proc/acpi/*/*

Check the info in this topic, starting with andisk’s second post:
viewtopic.php?p=1853532#p1853532

[Spectrum75]

Umm My laptop originally came with windows 7, then after the support ended I had upgraded to windows 10. The brightness key stopped working ever since that.
I have 2 hardisk with me one is running windows 10 and the second one has Linux mint installed. I prefer linux mint whenever I can, because it is faster than windows 10 which is really slow like a snail on my laptop, but still if its really necessary like some application only works on windows and does not on wine or something like that happens which is exclusive to windows then only I use that hardisk.

Anyways I ran the command sudo strings /sys/firmware/acpi/tables/DSDT | grep -i 'windows ' | sort and got the following output:

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Windows 2001
Windows 2001 SP1
Windows 2001 SP2
Windows 2006
Windows 2006
Windows 2006
Windows 2006
Windows 2006
Windows 2006
Windows 2006
Windows 2009
Windows 2009
Windows 2009
Windows 2009
Windows 2009
Windows 2009
Windows 2009

[roblm]

The parameter acpi_osi=! \"acpi_osi=Windows 2009\" is the only Windows parameter you will test in the grub file. Use the instructions how to add it in the linked topic:

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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=! \"acpi_osi=Windows 2009\""

[Spectrum75]

I tried it but not working

[roblm]

Try the other steps in that linked topic by andisk.

[Spectrum75]

Sorry for the late reply but with the new release (20.1) I can see the brightness meter inside the battery icon, but like I said before it isn't able to control the brightness

[Spectrum75]

Update: So I found this awesome cinnamon applet called QRedshift, which does the job and also it even has controls for redhsift