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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Backlight control not working on Pascal / GP106 using nouveau drivers"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100446#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Backlight control not working on Pascal / GP106 using nouveau drivers"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100446">bug 100446</a>
from <span class="vcard"><a class="email" href="mailto:carlo@caione.org" title="Carlo Caione <carlo@caione.org>"> <span class="fn">Carlo Caione</span></a>
</span></b>
<pre>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
---
<span class="quote">> MMIO32 W 0x00d980 0x0000007f PGPIO+0x980 <= 0x7f</span >
< MMIO32 W 0x619484 0x0000ff00 PDISPLAY.VGA.CR+0x84 <= 0xff00
---
<span class="quote">> MMIO32 W 0x619484 0x00007000 PDISPLAY.VGA.CR+0x84 <= 0x7000</span >
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.</pre>
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