![]() When you change the acpi_os name, you're literally changing the way all of your HW will behave at runtime. These tables describe everything from how to clock your CPUS, to suspend/resume, thermal regulation, multiple displays (the external display button), and of course, hotkeys like brightness. This code will change depending on the OS you're running, or in your case, the OS name you changed it to. There's this thing called ACPI, it's like perl for HW control, actual code is kept in your BIOS and then executed on demand by the OS (it has an interpreter). In response to the ACPI tweak proposed, it's important to understand what you're actually doing to achieve "brightness controls" for your Linux desktop and what the cost is. Intel HD Graphics card not recognized in System Info ![]() There's nothing to install, it's there by default.
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