max brightness

[Andy Green]

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Somebody in the thread at some point said:
| I was playing around with changing the brightness by putting number in
| the brightness file under /sys/class/... and I noticed that I'm not
| allowed to write anything higher than 63.  Is that the max brightness?
| The only reason I have doubts about it is because 63 seems to be such an
| arbitrary number.  I would like to know if it's possible to make it even
| brighter.

You can soak it in petrol and set it on fire, otherwise 63 is the max.

This number is coming out of pcf50633 PMU PWM controller for LED
backlight.  If it makes you any happier the numbers are "semi-logarithmic"


Bit 5:0 LEDOUT - LED output voltage select register (address 28h)
bit description    Access R/W     Reset[1] 111111[2]

Description

output current setting: I LED = V LEDFB ⁄ R SENSE ;
examples from the 6-bit semi-logarithmic range
Code VLEDFB (mV)[3]

000000:reserved
000001: 2
000011:10
001000:27
001010:37
001110:56
010010:81
010110:113
011010:149
011110:196
100010:250
100110:318
101010:401
101110:501
110010:626
110110:778
111010:961
111111:1250

...


- -Andy
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