[PATCH resend 0/4] Make video.use_native_backlight=1 work properly with nouveau

Hi All,

I know it has not been that long since the last send of this series, but
it has been very quiet, and I would like to see some discussion on it
(or it being applied at once, that is fine too :)

This patch-set adds backlight device (un)registration notification and
makes acpi-video listen to it, so that video.use_native_backlight=1 still
works if a raw interface gets loaded *after* acpi-video has been initialized.

It also changes nouveau to always register its raw interface, as all the other
kms drivers do, acpi_video_backlight_support() is only intended to avoid the
loading of multiple (possibly conflicting) firmware drivers, not to avoid
loading raw drivers.

In the mean time I've gotten feedback from a user with a laptop which needs
video.use_native_backlight=1 and uses nouveau, and he has confirmed that this
patch-set works as advertised, see:
https://bugzilla.redhat.com/show_bug.cgi?id93171

Regards,

Hans