Hello all, Good news for all owners of the Lenovo IdeaPad Y470 and Lenovo IdeaPad Y570, I've managed to make an ugly hack that works around a detection issue in the kernel (https://bugzilla.kernel.org/show_bug.cgi?id=42696)
Until a correct fix has been comitted for the kernel, you can use a hack for overwriting the wrongly detected ACPI handle. More information on that is available in: https://github.com/Bumblebee-Project/bbswitch/issues/2#issuecomment-3797568 Please note that this hack is by no means a real solution, but an ugly workaround. Regards, Peter
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