James Ferguson 2bc38e3784 IR: change to non-linear brightness steps ...

Prior Incrementing/decrementing by fixed steps (typically 10) means large
perceptual jumps at low brightness and small jumps at high brightness.  This
change moves to a geometric progression, closer at the bottom of the range and
widely spaced at the top.

While it could be done as a relative jump (incrementing by bri/4 and
decrementing bri/5 works quite well), it makes for irregular behavior when
moving back and forth.

2021-02-13 18:29:56 -05:00

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