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Screen brightness stuck at maximum
August 29, 2016
December 3, 2023
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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_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.