This is fixed upstream in the 3.10-rc4 kernel by this commit:
author Ash Willis 2013-05-29
committer Rafael J. Wysocki 2013-06-01
commit 780a6ec640a3fed671fc2c40e4dd30c03eca3ac3
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.
References: https://bugzilla.kernel.org/show_bug.cgi?id=56661
Signed-off-by: Ash Willis <ashwil...@programmer.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
This has been backported to the upstream 3.2.47 kernel as commit
8de5f8abdee26b1dc13e98c401a68637df2ad0dc
The progress of having the 3.2.47 kernel SRU's to Ubuntu 12.04 "Precise
Pangolin" can be followed at
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1193029
** Bug watch added: Linux Kernel Bug Tracker #56661
http://bugzilla.kernel.org/show_bug.cgi?id=56661
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Fix Committed
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which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1173059
Title:
Ubuntu 13.04 boots to dark screen on HP G6 laptop - ACPI backlight
woes
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