Public bug reported:
lcd4linux internally-defined max backlight value is wrong, and the
backlight command isn't being sent always (or is sent incorrectly). The
max is 1 but that makes the backlight not even visible as does 0. Higher
values work despite the error, but after 0 or 1 is used, the light will
not come on without unplugging it. 2 sets it to maximum, even though the
documentation specifies 0xFF (255) is the max: <https://github.com/mini-
box/picoLCD/blob/master/doc/picolcd-256x64-protocol-rev3.txt>. The max
*and default* should be 255, and the backlight command seems to need to
be fixed. Default contrast should be 255 not 0 (0 makes it appear blank,
so I thought the driver didn't work throughout many configuration
changes and tests). Summary: 1. Make backlight max and default 255 (and
possibly fix the command); 2. make default contrast 255. These values
may only apply to picoLCD 256x64 but I'm not sure, that's all I have.
The repo where I have placed the documentation link may be useful as
that is the official open source driver.
** Affects: lcd4linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2120244
Title:
backlight and contrast values are wrong for picoLCD 256x64
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