[Nouveau] [Bug 98677] [NVAC] iMac9, 1 effective backlight brightness range changes after S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98677

--- Comment #8 from Jeffery Miller <jefferym at gmail.com> ---
I patched as suggested having it use the nva3_bl_ops. The backlight remained
dark in this case. I was able to get the backlight to turn on by setting values
with nvapoke to match values I had seen earlier:

nvapoke 0x0061c080 0x1
nvapoke 0x0061c084 0x80000401

I noticed from the mmiotrace of the binary driver that it seems to set these
two registers when the brightness changes.
I'm away from the machine at the moment to post the details that seemed
relevant to me. 

I am not sure which registers might be important to check before and after. 

I'll look at the trace again and pop into it for some questions

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