[Bug 65601] Lenovo T440s backlight step too large on kernel v3.13 with intel_backlight

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=65601

--- Comment #21 from Jani Nikula <jani.nikula at intel.com> ---
If the /sys/class/backlight/intel_backlight/brightness interface works fine and
supports as many brightness levels as you like, this is not a bug in i915.

If you're using acpi_backlight=vendor kernel parameter, I believe ACPI video in
3.13 will only report the backlight keys to userspace, and won't change the
brightness. Aaron, is this correct? In this case, it's also not a bug in ACPI
video.

I think what's left is userspace.

Aaron, any other things to check?

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