Packard Bell EasyNote LV need i915.invert_brightness=1

[Petter Reinholdtsen]

[Daniel Vetter]
>> Is there some other quirk table for acpi that also need to be updated?
> 
> If the acpi brightness controller is broken, it needs to be quirked
> away.  For that please file a bug report against the ACPI subsystem.

Right.  Where do I do that?  I can do it if I know what to do. :)

> With that done the automagic fallback rules of the intel DDX driver
> should expose the "right" backlight interface through the backlight
> xrandr property. If KDE's powerdevil isn't using that one (and frobs
> around with the backlight controllers directly) that'd be a bug in
> kde.

I discovered that by adding acpi_backlight=vendor and keeping the
i915.invert_brightness=1 setting, the screen went black again.  So
these settings seem to cancel each other out.  But if I remove
i915.invert_brightness=1, the screen no longer turn black, and KDE no
longer turn off the screen when I log in, because instead of using the
acpi_backlight interface it is using the intel_backlight interface,
which is not inverted.

So I wonder, perhaps i915.invert_brightness=1 is the wrong quirk for
this machine?

-- 
Happy hacking
Petter Reinholdtsen