[Bug 63671] HP 2000-2d11dx needs inverted backlight brightness

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=63671

--- Comment #3 from Bryan Hundven <bryanhundven at gmail.com> ---
(In reply to Daniel Vetter from comment #1)
> Most likely not, the backlight inversion is only known to affect gen4 models
> from Acer. You have a gen7 modell from HP.
> 
> Please boot with drm.debug=0xe on latest kernels but without any other
> options and then attach the full dmesg to this report.
> 
> Also please try out whether any of the backlight interfaces in
> /sys/class/backlight work or whether the backlight adjustment keys work.
> 
> The background is that on some recent machines something (which we haven't
> tracked down yet) resets the backlight to 0 when booting. Inverting the
> scale doesn't fix this at all (and actually breaks your backlight pretty
> badly overall).

Tried #1 from Jani's post and that worked. I've not tried #2.

Attached is the dmesg from drm.debug=0xe.

Backlight controls do not seem to work, but I haven't tried with
video.use_bios_initial_backlight=0 yet.

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