PROBLEM: Acer D255E Backlight out for 10 seconds with ACPI

[Dan <vxltage@gmail.com>]

Hello,

Apologies if this was sent to the wrong place.

With an Acer AOD255E netbook, the backlight goes out for exactly 10
seconds before returning while booting.

This is a backlight issue and not KMS, as I can shine a flashlight at
the screen and still see boot text scrolling.

With "acpi=off" appended to the kernel line, this no longer occurs (Fn
key backlight controls still work with this appended). With every
other acpi option I have tried, this still occurs though. This
includes "acpi_backlight" and "acpi_display_output". With
"acpi_backlight=vendor" the entry in /sys/class/backlight changes from
acpi_video0 to acer_wmi, but backlight still goes out.

Otherwise backlight works correctly.

Kernel version (I have reproduced it with several other older kernels
as well on different distributions):
Linux version 3.5.4-1-ARCH (tobias@T-POWA-LX) (gcc version 4.7.1
20120721 (prerelease) (GCC) ) #1 SMP PREEMPT Sat Sep 15 08:12:04 CEST
2012

I compiled the system information from /proc and lspci here (You can
also find a dmesg comparision between a regular boot and one with acpi
disabled here):
http://pastebin.com/u/vxl

I'll also point you to the Ubuntu bug report I filed awhile back while
using that. It contains information on the exact same system (running
Ubuntu rather than Arch Linux):
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1034222

Thanks for your time.