From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: Commit 7751ab8e600f26e10c2ba12a92d48a4852a51da8 Date: Tue, 12 Apr 2011 16:20:09 +0100 Message-ID: <20110412152009.GA32032@srcf.ucam.org> References: <4D9B4094.4010609@absence.it> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from cavan.codon.org.uk ([93.93.128.6]:53415 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752380Ab1DLPUQ (ORCPT ); Tue, 12 Apr 2011 11:20:16 -0400 Content-Disposition: inline In-Reply-To: <4D9B4094.4010609@absence.it> Sender: platform-driver-x86-owner@vger.kernel.org List-ID: To: Marco Chiappero Cc: platform-driver-x86@vger.kernel.org, Javier Achirica , Mattia Dongili On Tue, Apr 05, 2011 at 06:17:24PM +0200, Marco Chiappero wrote: > I just wanted to report possible issues related to the new backlight > control implemented in commit > 7751ab8e600f26e10c2ba12a92d48a4852a51da8 [sony-laptop: implement new > backlight control method]. I and Javier Achirica have been using it > for a while on different notebook models and agree that values close > to 0 are far too dark to be useful, while 0 means totally off for > both. Moreover flickering has been reported with CCFL LCDs (still > present on a few models, such as the Vaio F) by another tester. > In fact, with these Vaios, Windows never goes below a certain model > specific backlight lower bound, provided along with the ALS > capability. However, this requires further code not yet implemented > (or the ALS support already available but not yet included). Please > consider correcting or delaying that patch. Hmm. How low is useful? There's no real problem with shifting everything by an offset. -- Matthew Garrett | mjg59@srcf.ucam.org