From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: Regression: radeonfb: No synchronisation on CRT with linux-2.6.13-rc5 Date: Sun, 07 Aug 2005 23:48:08 +0200 Message-ID: <1123451289.30257.118.camel@gaston> References: <1123195493.30257.75.camel@gaston> <1123401069.30257.102.camel@gaston> <3EF2003B-12DF-4EBB-B304-59614AEFAA09@mac.com> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1E1t4p-0001un-Sc for linux-fbdev-devel@lists.sourceforge.net; Sun, 07 Aug 2005 14:53:03 -0700 Received: from gate.crashing.org ([63.228.1.57]) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1E1t4o-0007XE-N3 for linux-fbdev-devel@lists.sourceforge.net; Sun, 07 Aug 2005 14:53:04 -0700 In-Reply-To: Sender: linux-fbdev-devel-admin@lists.sourceforge.net Errors-To: linux-fbdev-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" To: Bodo Eggert <7eggert@gmx.de> Cc: Kyle Moffett , LKML , linux-fbdev-devel@lists.sourceforge.net On Sun, 2005-08-07 at 19:25 +0200, Bodo Eggert wrote: > On Sun, 7 Aug 2005, Kyle Moffett wrote: > > On Aug 7, 2005, at 03:51:07, Benjamin Herrenschmidt wrote: > > > > Ah ! Interesting... I don't see why PREEMPT would affect radeonfb > > > though ... Can you try something like wrapper radeon_write_mode() with > > > preempt_disable()/preempt_enable() and tell me if it makes a > > > difference ? > > Did not help. The values used to initialize the mode seem to be wrong. > Copying the aty directory from 2.6.12 did not help, too. I don't see how PREEMPT could have any impact there unless you are experiencing memory corruption... or one of those panels that have so subtle timing issues that they sometimes don't sync depending on how many flies you have in your room.... Ben. ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf