Re: PROBLEM: Acer D255E Backlight out for 10 seconds with ACPI

[joeyli <jlee@suse.com>]

於 三，2012-09-26 於 16:48 -0400，Dan 提到：
> 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. 

Could you please try this kernel parameter?
video.use_bios_initial_backlight=0


Thanks
Joey Lee

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