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

[bugzilla-daemon at freedesktop.org]

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

A. Chaud <nvbugz at sparklabs.me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #125562|0                           |1
        is obsolete|                            |

--- Comment #15 from A. Chaud <nvbugz at sparklabs.me> ---
Created attachment 125642
  --> https://bugs.freedesktop.org/attachment.cgi?id=125642&action=edit
backlight control w/ gpio check

Thank you for the comments.

This version removes the powerpc ifdef and exposes the full range of brightness
values.  I also fixed the formatting.  Let me know if I missed any of it.

Regarding the 0x535.  It's a workaround for bug 31120.  The lower half of the
register gets set to 0x7fff upon waking from suspend which disables the
backlight. This changes it back to a working value.

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