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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #12 from Ilia Mirkin <imirkin at alum.mit.edu> ---
You can get vbios once nouveau is loaded from debugfs. It should correspond
1:1 to the of blob as well.

On Aug 5, 2016 11:37, <bugzilla-daemon at freedesktop.org> wrote:

> *Comment # 11 <https://bugs.freedesktop.org/show_bug.cgi?id=31122#c11> on
> bug 31122 <https://bugs.freedesktop.org/show_bug.cgi?id=31122> 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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