dmesg shows "video.use_native_backlight=1" is used. This kernel
parameter is no longer available. You can replace with "acpi_video"
acpi_backlight= [HW,ACPI]
acpi_backlight=vendor
acpi_backlight=video
If set to vendor, prefer vendor specific driver
(e.g. thinkpad_acpi, sony_acpi, etc.) instead
of the ACPI video.ko driver.
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https://bugs.launchpad.net/bugs/1890873
Title:
no intel_backlight file
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