[Bug 68471] Display extremely dark on Dell XPS 13 since 3.10 Kernel in EFI mode
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Sun Jan 12 18:41:19 PST 2014
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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