<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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#c7">Comment # 7</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 <a class="email" href="mailto:karolherbst@gmail.com" title="Karol Herbst <karolherbst@gmail.com>"> Karol Herbst</a> <pre>(In reply to Carlo Caione from <a href="show_bug.cgi?id=100446#c4">comment #4</a>) > 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: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.16-rc6&id=9e75dc61eaa9acd1bff83c3b814ac2af6dc1f64c">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.16-rc6&id=9e75dc61eaa9acd1bff83c3b814ac2af6dc1f64c</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>