[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 #10 from Jeffery Miller <jefferym at gmail.com> ---
Created attachment 127925
  --> https://bugs.freedesktop.org/attachment.cgi?id=127925&action=edit
Force NV50_PDISP_SOR_PWM_DIV when setting brightness for the iMac9,1 subvendor

This patch always sets the div to 0x1 for the device on this machine. It allows
consistent behavior between the first boot of the system and after a resume.

I apply it on each backlight change mimicking the nvidia blob's behavior in
this case. However, the nvidia blob sets the value to 0x17 in my observations.

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