[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 #10 from Aaron Lu <aaron.lu at intel.com> ---
>From the acpidump, the ACPI control method to set brightness will make use of
IGD when CSMF is 0, and will directly write an IO port when CSMF is 1. I guess
CSMF is a reflection of whether CSM mode is in use.

Sounds like something is broken in i915 to set brightness on v3.13 kernels.

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