On Tue, Sep 27, 2022 at 01:04:52PM +0200, Hans de Goede wrote: > So to fix this we need to make acpi_video_get_backlight_type() > return native on the Acer Chromebook Spin 713. Isn't the issue broader than that? Unless the platform is Windows 8 or later, we'll *always* (outside of some corner cases) return acpi_backlight_vendor if there's no ACPI video interface. This is broken for any platform that implements ACPI but relies on native video control, which is going to include a range of Coreboot platforms, not just Chromebooks. I think for this to work correctly you need to have the infrastructure be aware of whether or not a vendor interface exists, which means having to handle cleanup if a vendor-specific module gets loaded later.
