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. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
