https://bugs.freedesktop.org/show_bug.cgi?id=100446
--- Comment #7 from Karol Herbst <[email protected]> ---
(In reply to Carlo Caione from comment #4)
> 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.
Can you check that this is fixed in 4.16-rc6? A fix landed to address backlight
problems and it might be the same you had:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.16-rc6&id=9e75dc61eaa9acd1bff83c3b814ac2af6dc1f64c
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