From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lukas Hejtmanek Subject: Re: 2.6.25-rc1 regression - IBM ACPI backlight Date: Fri, 15 Feb 2008 12:02:13 +0100 Message-ID: <20080215110213.GA5648@ics.muni.cz> References: <20080214103801.GB4366@ics.muni.cz> <20080214122452.GB12775@khazad-dum.debian.net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from minas.ics.muni.cz ([147.251.4.40]:46566 "EHLO minas.ics.muni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759244AbYBOLCT (ORCPT ); Fri, 15 Feb 2008 06:02:19 -0500 Content-Disposition: inline In-Reply-To: <20080214122452.GB12775@khazad-dum.debian.net> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Henrique de Moraes Holschuh Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org On Thu, Feb 14, 2008 at 10:24:52AM -0200, Henrique de Moraes Holschuh w= rote: > > as of 2.6.25-rc1, there is no more /sys/class/backlight/acpi_video1= which > > controlled LVDS backlight on Lenovo ThinkPad T61. There is still > > acpi_video0 which seems to have sane values but echo N > brightness= has no > > effect at all. > >=20 > > thinkpad_acpi module reports that ACPI controlled backlight is pres= ent. >=20 > Please report this to linux-acpi @ vger . kernel . org... >=20 > It is likely caused by the stuff to locate and disable the unused vid= eo > device in the DSDT (apparently it got the wrong device?!). >=20 > However, BEFORE reporting to linux-acpi, please test it in single use= r mode > without X *ever* being loaded on that boot. New X disables the BIOS > brightness changes that ACPI uses. 2.6.24 kernel has two acpi_video[01]. 2.6.25-rc1 does not, it contains = only acpi_video0 (even in text mode in single user without X being loaded) w= hich does not work at all. --=20 Luk=E1=B9 Hejtm=E1nek - 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