Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932395AbVKMLGW (ORCPT ); Sun, 13 Nov 2005 06:06:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932465AbVKMLGW (ORCPT ); Sun, 13 Nov 2005 06:06:22 -0500 Received: from pilet.ens-lyon.fr ([140.77.167.16]:19377 "EHLO pilet.ens-lyon.fr") by vger.kernel.org with ESMTP id S932395AbVKMLGV (ORCPT ); Sun, 13 Nov 2005 06:06:21 -0500 Date: Sun, 13 Nov 2005 12:06:18 +0100 From: Samuel Thibault To: "Antonino A. Daplas" Cc: Linus Torvalds , Andrew Morton , Dave Jones , Jason , Linux Kernel Development Subject: Re: [PATCH] vgacon: Workaround for resize bug in some chipsets Message-ID: <20051113110618.GD4117@implementation> Mail-Followup-To: Samuel Thibault , "Antonino A. Daplas" , Linus Torvalds , Andrew Morton , Dave Jones , Jason , Linux Kernel Development References: <43766AC5.9080406@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <43766AC5.9080406@gmail.com> User-Agent: Mutt/1.5.9i-nntp Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1807 Lines: 51 Antonino A. Daplas, le Sun 13 Nov 2005 06:20:53 +0800, a ?crit : > "I updated to the development kernel and now during boot only the top of the > text is visable. For example the monitor screen the is the lines and I can > only see text in the asterik area. > --------------------- > | **************** | > | * * | > | * * | > | **************** | > | | > | | > | | > --------------------- Are you missing some left and right part too? What are the dimensions of the text screen at bootup? What bootloader are you using? (It could be a bug in the boot up text screen dimension discovery). > I have a Silicon Graphics 1600sw LCD panel with a Number Nine Revolution 4 > video card." Does vgacon.c properly discovers that it is a VGA board? > This bug seems to be a glitch in the VGA core of this chipset. Resizing > the screen triggers the mentioned bug. Do vga-only games (like old DOS-mode games) work with it? > The workaround is to make vgacon avoid calling vgacon_doresize() if the > display parameters did not change. I.e. never call it, actually. > A definitive fix will need to be provided by someone who knows and has the > hardware. I'm not sure it is hardware-specific. Maybe you have a combination of vga bios/bootloader/vga=ask/... that prevents vgacon.c from properly discovering the dimensions of the text screen. Well, else it looks like a "safe side" patch: people now hit by such bug won't be hit any more unless using stty or such. Regards, Samuel - 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/