Comment 40 for bug 1218547

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Surak (smkozasa) wrote : Re: Clevo W350ST brightness keys don't work on Kubuntu

Without adding "acpi_backlight=vendor" in the boot parameters:

ls /sys/class/backlight
acpi_video0 intel_backlight

Adding "acpi_backlight=vendor" in the boot parameters:

ls /sys/class/backlight/
intel_backlight

So Fn keys start working with "acpi_backlight=vendor" boot parameter because the keys stop changing /sys/class/backlight/acpi_video0/brightness instead of /sys/class/backlight/intel_backlight/brightness.