[Nouveau] [Bug 100446] Backlight control not working on Pascal / GP106 using nouveau drivers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100446

--- Comment #4 from Carlo Caione <carlo at caione.org> ---
For the sake of completeness some more info on this.

The two settings differ only for couple of accesses:

< MMIO32 W 0x00d980 0x000000ff PGPIO+0x980 <= 0xff
---
> MMIO32 W 0x00d980 0x0000007f PGPIO+0x980 <= 0x7f

< MMIO32 W 0x619484 0x0000ff00 PDISPLAY.VGA.CR+0x84 <= 0xff00
---
> MMIO32 W 0x619484 0x00007000 PDISPLAY.VGA.CR+0x84 <= 0x7000

The problem is that poking at those registers using nvapeek / nvapoke doesn't
change the brightness.

Also trying to use nvammiotracereplay to reply step-by-step the mmio trace has
no effect on the brightness.

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