Note that other HP machines are being blacklisted in acpi/video.c, e.g.
commit 780a6ec640a3fed671fc2c40e4dd30c03eca3ac3
Author: Ash Willis <ashwillis.ker...@gmail.com>
Date: Wed May 29 01:27:59 2013 +0000
ACPI / video: ignore BIOS initial backlight value for HP Pavilion g6
This patch addresses kernel bug 56661. BIOS reports an incorrect
backlight value, causing the driver to switch off the backlight
completely during startup. This patch ignores the incorrect value from
BIOS.
You could tweak that patch to match your machine and submit it.
** Package changed: xserver-xorg-video-intel (Ubuntu) => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1158934
Title:
HP ProBook 6570b using acpi_video0 for backlight rather than
intel_backlight
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