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Tags: screen   brightness   grub  
Link: ๐Ÿ” See Original Answer on Ask Ubuntu โง‰ ๐Ÿ”—

Title: Screen brightness stuck at maximum
ID: /2016/08/29/Screen-brightness-stuck-at-maximum
Created: August 29, 2016
Upload: December 3, 2023    Layout:  post
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I found a bug report on launch pad describing the same problem and some solutions: Samsung 7 screen brightness

Basically ACPI is implemented improperly on your motherboard with Intel CPU and Radeon graphics. The solution is to add the parameters acpi_osi=linux and acpi_backlight=video to your kernel command lines in Grub. You can google how to modify grub kernel parameters and ask any questions you have on updating grub.

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