[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #4 from Henri Verbeet <hverbeet at gmail.com> ---
I think it depends a bit on the specific model, but many Macs will only boot
EFI from USB. Refind (http://www.rodsbooks.com/refind/index.html) is
potentially a way around that, although I'm not entirely sure if that counts as
booting in EFI mode or in BIOS mode.

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