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[Dmitrijs Ledkovs <619726@xxxxxxxxxxxxxxxxxx>]

Right investigating further:

On my machine /sys/class/backlight/mbp_backlight is a symlink to
/sys/devices/virtual/backlight/mbp_backlight

In there the max brightness value is 15. And the lowest value
(experimental) is 0.

echo 0..15 into the brightness file in the above mentioned folder
changes the screen brightness correctly gradually.

So the problem is somewhere higher level with whatever thing is called
when I press the brightness up/down keys.

** Summary changed:

- [regression since lucid] LCD backlight brightness steps are inconsistent
+ [regression since lucid] LCD backlight brightness steps are inconsistent, echo XX > brightness works fine

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https://bugs.launchpad.net/bugs/619726

Title:
  [regression since lucid] LCD backlight brightness steps are
  inconsistent, echo XX > brightness works fine