[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 #2 from Bastian Triller <bastian.triller at gmail.com> ---
(In reply to comment #1)
> If you are booting in EFI mode, does it work if you boot in legacy bios
> mode?  Since it's a mac, it probably requires some mac specific hack.

I'm booting via EFI stub. I'm not sure how to boot the bios emulation mode. Is
it possible to plug in a usb stick with a "normal" live system to boot in
emulation mode?

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