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Lenovo u460 Ambient Light Sensor/Backlight/Keyboard Weirdness

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https://bbs.archlinux.org – Hi all,I have tried to figure this problem out ever since I first installed Arch a few months ago (coming from Fedora/Ubuntu where this never occured). This is going to be a little hard to describe, so please bear with me. Here are the symptoms:1) The brightness controls (Fn+Up/Fn+Down) don't affect the screen brightness. Also, if acpi_backlight=legacy, then the message "ACPI: Failed to switch the brightness" pops up in dmesg. If acpi_backlight=vendor, then nothing gets printed, though the tty console cursor does "blip" as if a normal key were pressed.2) If acpi_backli (HowTos)