Brighthness and contrast sliders in "video settings" change nothing, they have no effect on the graphics no matter whether they're at 50%, 0% or 100% or anything in between.
Video Renderer: OpenGL 4.6 (Shader)
GPU: GeForce 940M/PCIe/SSE2
Nvidia driver version : 460.91.03
System: Kernel: 5.4.0-90-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 5.0.6
wm: muffin dm: LightDM Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal
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