Comment 86 for bug 1178796

Thanks. Patch tested on kernel 3.13.0-rc8 for Saucy:

$ modinfo video
filename: /lib/modules/3.13.0-031300rc8-generic/kernel/drivers/acpi/video.ko
license: GPL
description: ACPI Video Driver
author: Bruno Ducrot
srcversion: 7F3F9A0CC7554649507A11E
alias: acpi*:LNXVIDEO:*
depends:
vermagic: 3.13.0-031300rc8-generic SMP mod_unload modversions
parm: brightness_switch_enabled:bool
parm: allow_duplicates:bool
parm: use_native_backlight:bool

It doesn't seem to work and there is still a ACPI_video0 interface.

$ dmesg | grep video
[ 0.253443] pci 0000:00:02.0: Boot video device
[ 1.380146] Modules linked in: ahci(+) libahci atl1c i915(+) i2c_algo_bit drm_kms_helper video drm
[ 16.952911] asus_laptop: Backlight controlled by ACPI video driver

What other debug information can I provide?