[Nouveau] [Bug 31122] Cannot control backlight intensity on Powerbook

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31122

--- Comment #11 from A. Chaud <nvbugz at sparklabs.me> ---
nvagetbios wasn't able to extract the bios.  From what I gathered after
searching, openfirmware handles vbios differently (ie: no checksums, smaller
vbios, etc).  I found a nv34 openfirmware bios someone else dumped and nvbios
is unable to decode the GPIO section.

However, if the aim is ensuring the device has a backlight, I believe it's
already done.  In nouveau_backlight_init, it first checks to ensure there's a
display on either LVDS or eDP.  Can we not reasonably assume that if the gpu
has a LVDS or eDP panel attached that it also has a backlight?  My init
function is a slightly altered version of the existing nv40_backlight_init
function which doesn't have a backlight check either.

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