Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752689Ab1EII6V (ORCPT ); Mon, 9 May 2011 04:58:21 -0400 Received: from cantor2.suse.de ([195.135.220.15]:48061 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751074Ab1EII6U (ORCPT ); Mon, 9 May 2011 04:58:20 -0400 Date: Mon, 09 May 2011 10:58:19 +0200 Message-ID: From: Takashi Iwai To: Melchior FRANZ Cc: linux-kernel@vger.kernel.org, "Joey Lee" , chris@chris-wilson.co.uk, dri-devel@lists.freedesktop.org Subject: Re: i915/kms/backlight-combo mode problem In-Reply-To: <201105072222.41807@rk-nord.at> References: <4DC47937020000230002C446@novprvlin0050.provo.novell.com> <201105061823.07083@rk-nord.at> <201105072222.41807@rk-nord.at> User-Agent: Wanderlust/2.15.6 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.7 Emacs/23.2 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1313 Lines: 31 At Sat, 7 May 2011 22:22:40 +0200, Melchior FRANZ wrote: > > * Melchior FRANZ -- Friday 06 May 2011: > > last patch prevents the backlight from being turned off, but it also > > breaks the brightness adjustment keys at runtime with acpi_osi=Linux. > > It has turned out that acpi key events seem to be handled correctly > and even the state of /sys/class/backlight/acer-wmi/brightness is > updated accordingly. The only problem is that this maintained > brightness state isn't applied to the actual backlight. It remains > at highest level. Google pointed me to this workaround for another > Acer notebook: > > https://help.ubuntu.com/community/AspireTimeline/Fixes#Alternative%20fix%20for%2010.10 > > This uses the acpid to write the brightness value to the display > using setpci. And this works on my notebook as well (Acer Travelmate > 5735Z-452G32Mnss). Then we miss something. With the hack above, you are doing nothing but writing LBPC register value externally from setpci. It implies that the write to LBPC basically works on your machine. Takashi -- 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/