[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 #12 from Dennis Jacobfeuerborn <dennisml at conversis.de> ---
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.

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