[Bug 31122] Cannot control backlight intensity on Powerbook - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 31122] Cannot control backlight intensity on Powerbook
Date: Fri, 05 Aug 2016 16:37:34 +0000	[thread overview]
Message-ID: <bug-31122-8800-YNthPCKXEd@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-31122-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>

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

--- Comment #11 from A. Chaud <nvbugz-ZdXa/xnzD07wXD0AkxfrAg@public.gmane.org> ---
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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