From mboxrd@z Thu Jan 1 00:00:00 1970 From: joeyli Subject: Re: PROBLEM: Acer D255E Backlight out for 10 seconds with ACPI Date: Thu, 27 Sep 2012 07:19:03 +0800 Message-ID: <1348701543.8621.104.camel@linux-s257.site> References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from smtp.nue.novell.com ([195.135.221.5]:56270 "EHLO smtp.nue.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750945Ab2IZXZd (ORCPT ); Wed, 26 Sep 2012 19:25:33 -0400 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Dan Cc: linux-acpi@vger.kernel.org =E6=96=BC =E4=B8=89=EF=BC=8C2012-09-26 =E6=96=BC 16:48 -0400=EF=BC=8CDa= n =E6=8F=90=E5=88=B0=EF=BC=9A > Hello, >=20 > Apologies if this was sent to the wrong place. >=20 > With an Acer AOD255E netbook, the backlight goes out for exactly 10 > seconds before returning while booting. >=20 > This is a backlight issue and not KMS, as I can shine a flashlight at > the screen and still see boot text scrolling. >=20 > With "acpi=3Doff" 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=3Dvendor" the entry in /sys/class/backlight changes f= rom > acpi_video0 to acer_wmi, but backlight still goes out. >=20 > Otherwise backlight works correctly.=20 Could you please try this kernel parameter? video.use_bios_initial_backlight=3D0 Thanks Joey Lee -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html