From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marco Chiappero Subject: Re: Need help debugging Sony Vaio VPCY2 backlight control problem Date: Mon, 04 Jul 2011 21:51:13 +0200 Message-ID: <4E1219B1.9050404@absence.it> References: <4E0E2155.4070508@fedoraproject.org> <4E0E4637.7000902@absence.it> <4E117DF7.2000602@fedoraproject.org> <4E119CED.1060109@absence.it> <4E120DD9.9070506@fedoraproject.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4E120DD9.9070506@fedoraproject.org> Sender: platform-driver-x86-owner@vger.kernel.org To: Michel Alexandre Salim Cc: linux-acpi@vger.kernel.org, platform-driver-x86 , Mattia Dongili List-Id: linux-acpi@vger.kernel.org Il 04/07/2011 21:00, Michel Alexandre Salim ha scritto: > Hi Marco, Hi, > Unfortunately, the results are, again, rather confusing. With > sony-laptop.ko, after running backlight_fix once, actual_brightness has > a nonsensical value -- 55. It looks reasonable, don't worry about it. > I tried setting it to 5, and something > actually happens this time - actual_brightness now reads 5 rather than > -1, and the screen brightness actually changes -- but, alas, too much > (if the brightness range is from 0 to 7, 5 should be rather bright, > instead it looked more like a 2 to me). This is weird, brightness level should be ~75%. > Further attempts to adjust brightness produced no result -- > actual_brightness now tallies with brightness, like the video.ko's > behavior, but the screen remained dim. Repeatedly running backlight_fix > does not resolve matter either. even more weird. I don't know if IGID has changed in the meantime, but there's something not working properly elsewhere. But definitely it's not a problem belonging to sony-laptop or video (which should be used because SBRT/GBRT methods, with 0 based values and 9 values range, pose problems with the current backlight device implementation in sony-laptop). > Anything else I can try? The patches attached by Rui. Sorry but I can't help further.