[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 #23 from tomasi <tomas.ivanek at gmail.com> ---
Hi,
I guess, this solved my issue.
video.use_native_backlight=1. Bellow are two examples.

bio at t440s:~$ uname -a
Linux t440s 3.13.0-031300-generic #201401192235 SMP Mon Jan 20 03:36:48 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux

a/- parameter was wrong (so basically without parameters)

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash use_native_backlight=1"

bio at t440s:/sys/class/backlight/intel_backlight/device/intel_backlight/subsystem/intel_backlight$
cat brightness
75, 138, 765

Only three modes are avalable

b/ - good parameters - video.use_native_backlight=1

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video.use_native_backlight=1"

modes are:
brigtness from down to max
0, 85, 170, 255, 340, 425, 510, 595, 680, 765, 851
from max to low
766, 681, 596, 511, 426, 341, 256, 171, 86, 1

remark:
0 .. means black screen

Strange is 1 difference when going up and then down.
So... parameters helped, but I prefer more modes around 100 value like i wrote
in comment #6. But, ok. What can I do.

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