[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 #13 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to Dennis Jacobfeuerborn from comment #12)
> Going back to CSM mode and testing:
> 
> Echoing values 0-100 into /sys/class/backlight/acpi_video0/brightness
> results in the display fading to that brightness level within 2-3 seconds.
> 
> Echoing values 0-4882 into /sys/class/backlight/intel_backlight/brightness
> results in no changes to the brightness of the display.

And for UEFI both are broken? Just from this is sounds like the native i915 pwm
isn't wired up to anything at all ...

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