[Bug 68471] Display extremely dark on Dell XPS 13 since 3.10 Kernel in EFI mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68471

--- Comment #14 from Dennis Jacobfeuerborn <dennisml at conversis.de> ---
Yes, in UEFI mode nothing happens when i echo values into the "brightness"
files though the respective "actual_brightness" shows the correct value
afterwards.

What's curious is about this is that this is one of those "Sputnik" Laptops
that were specifically designed to work with Linux and can be ordered with
Ubuntu pre-installed from Dell. Since they are very popular I can't be the only
one seeing this. I've got the version with Windows pre-installed though and
added Fedora in a dual-boot configuration.

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