No Backlight Control in 2.2.18pre21

[Benjamin Herrenschmidt]

>1: What is labelled as the 'contrast' button is actually the
>   wallstreet volume control.  Is this the case for other Pbooks?
>   (I can probably get hold of a 3400 to test, but kangas, lombards
>   and the like are all unreachable).  If this _is_ the case, could
>   we rename the constant?

Some wallstreet with passive matrix display also have a contrast button
(and contrast setting via the PMU). I found some infos about those and a
friend with such a machine to test with, I'll try to get something out if
I find some time.


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