From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [Bugme-new] [Bug 12235] New: /sys/devices/virtual/backlight/acpi_video0/brightness has it backwards Date: Tue, 16 Dec 2008 20:55:32 +0000 Message-ID: <20081216205532.GB14332@srcf.ucam.org> References: <20081216100023.2e437c8c.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from cavan.codon.org.uk ([93.93.128.6]:34526 "EHLO vavatch.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758737AbYLPUzh (ORCPT ); Tue, 16 Dec 2008 15:55:37 -0500 Content-Disposition: inline In-Reply-To: <20081216100023.2e437c8c.akpm@linux-foundation.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Andrew Morton Cc: linux-acpi@vger.kernel.org, bugme-daemon@bugzilla.kernel.org, khashayar.lists@gmail.com, "Rafael J. Wysocki" , Zhang Rui On Tue, Dec 16, 2008 at 10:00:23AM -0800, Andrew Morton wrote: > OK, that's weird. I have a suspicion that we're about to find out that > this is intentional, but I don't know what the fix is.. My recollection is that some BIOSes provide the list of brightness values in reverse order - someone posted a patch to sort them in-kernel, but I can't remember what happened to it. xbacklight will work because it triggers a direct write to the hardware if the acpi driver isn't loaded. -- Matthew Garrett | mjg59@srcf.ucam.org