Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754700Ab1CMKzl (ORCPT ); Sun, 13 Mar 2011 06:55:41 -0400 Received: from mailout04.t-online.de ([194.25.134.18]:56346 "EHLO mailout04.t-online.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752381Ab1CMKzj (ORCPT ); Sun, 13 Mar 2011 06:55:39 -0400 Message-ID: <4D7CA2A8.4010700@t-online.de> Date: Sun, 13 Mar 2011 11:55:36 +0100 From: =?UTF-8?B?UmljaGFyZCBTY2jDvHR6?= User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110304 Lanikai/3.1.9 MIME-Version: 1.0 To: Nikolai Kondrashov CC: Greg KH , Matthew Garrett , Randy Dunlap , linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org Subject: Re: [PATCH] Platform: add Samsung Laptop platform driver References: <20110310171940.GA24972@kroah.com> <4D790A20.3050105@gmail.com> <20110310180959.GA26927@kroah.com> <4D793D05.3070908@gmail.com> <20110310211519.GA11862@kroah.com> <4D79CB47.2030405@gmail.com> <20110311170313.GA10202@kroah.com> <4D7A72E3.1050407@gmail.com> <20110311193433.GB14204@kroah.com> <4D7A8419.6080107@gmail.com> <20110311203032.GA14384@kroah.com> <4D7C9668.3000902@gmail.com> In-Reply-To: <4D7C9668.3000902@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ID: SyDVHGZXghWTg9kSJr0T75oYZn80J63szGArsPg52nMgB9Zc+ENtyGM8uF7mP-PgpS X-TOI-MSGID: 935bd21a-b57f-4d21-a26b-2749be626601 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1195 Lines: 31 > Every time I execute this in the /sys/class/backlight/samsung directory: > sudo bash -c 'echo 1 > brightness' > brightness is reduced a little until it reaches the minimum. > > After that, every time I execute this: > sudo bash -c 'echo 8 > brightness' > it increases a little until it reaches the maximum. > > And each time a message appears in dmesg: "ACPI: Failed to switch the > brightness", until the brightness stops changing. > > At the same time, the little Gnome brightness adjustment window appears, > showing the percentage of the brightness, which drops/raises to > minimum/maximum in only four executions of these commands. After that, > while > brightness drops/raises with each execution, the percentage stays at > minimum/maximum. > > Is this all normal? That sounds like the driver is interfering with the ACPI video driver. Add "acpi_backlight=vendor" to your kernel boot parameters and try again. -- Regards, Richard Schütz -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/