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My PC is running Manjaro. Unfortunately since recently my PC is restarted by itself and is then displayed to me that.

[FAILED] Failed to start load/save screen backlight brightness of backlight:acpi_video0

Can someone please explain to me what this is and how I can fix it?

enter image description here

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Reset to default
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searching for the same error lead to this thread

Editing the grub to add acpi_backlight=video fixed it for me.

GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=video"
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  • could you please explain that to me as well? What is this acpi_backlight=video? Commented Dec 7, 2021 at 17:35

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