From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [PATCH] Intel FB pixel clock calculation fix Date: Fri, 26 Oct 2007 19:51:43 +0200 Message-ID: <20071026175143.GB1573@elf.ucw.cz> References: <20070910225221.f0eaf22c.akpm@linux-foundation.org> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1IlTLh-0008JF-2K for linux-fbdev-devel@lists.sourceforge.net; Fri, 26 Oct 2007 10:51:57 -0700 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123] ident=postfix) by mail.sourceforge.net with esmtp (Exim 4.44) id 1IlTLg-0002Qu-K0 for linux-fbdev-devel@lists.sourceforge.net; Fri, 26 Oct 2007 10:51:57 -0700 Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: Krzysztof Halasa Cc: "Antonino A. Daplas" , Andrew Morton , sylvain.meyer@worldonline.fr, linux-fbdev-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org On Tue 2007-09-11 14:18:57, Krzysztof Halasa wrote: > Andrew Morton writes: > > >> Intel framebuffer mis-calculated pixel clocks. > > > and... what are the consequences of this miscalculation? I need to know > > such things so that I can decide whether a change is needed in 2.6.23. And > > 2.6.22. > > The pixel clock (and thus both H and V sync) will be slower than > requested, so if you set the minimum allowed the display may not > sync. In case of really old CRT display it could theoretically > damage it. > > I'm using it with PAL TV (using RGB input - SCART connector) and > the bug prevented it from working at all (TV requirements are more > strict and made the bug visible). > > I think 2.6.22 would be overkill, .23 - not sure. I don't think this is -stable kind of bug. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/