[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 #22 from Aaron Lu <aaron.lu at intel.com> ---
(In reply to Jani Nikula from comment #21)
> 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.

Agree.

> 
> 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.

Yes, except that I'm not sure if the vendor driver(thinkpad-acpi in this case)
would do something weird.

Hi tomasi,
Please boot v3.13 kernel with video.use_native_backlight=1 and remove
acpi_backlight=vendor, see if that makes a difference. That should make
thinkpad-acpi do nothing for video related key.

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