Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261838AbUKUXVM (ORCPT ); Sun, 21 Nov 2004 18:21:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261842AbUKUXVM (ORCPT ); Sun, 21 Nov 2004 18:21:12 -0500 Received: from CPE-203-51-35-114.nsw.bigpond.net.au ([203.51.35.114]:31480 "EHLO e4.eyal.emu.id.au") by vger.kernel.org with ESMTP id S261838AbUKUXVJ (ORCPT ); Sun, 21 Nov 2004 18:21:09 -0500 Message-ID: <41A122E0.8070307@eyal.emu.id.au> Date: Mon, 22 Nov 2004 10:21:04 +1100 From: Eyal Lebedinsky Organization: Eyal at Home User-Agent: Mozilla Thunderbird 0.8 (X11/20040926) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel list Subject: help: sysrq and X X-Enigmail-Version: 0.86.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 929 Lines: 22 I am trying to diagnose a hard lockup. The only way I can reproduce it is with mythtv. When the system locks up (no mouse, no activity in X, no message logged) I can use magic sysrq, but I cannot see the output. Using 'r' does not enable console switching. However 'b' will boot the system, and I hope 's' and 'u' did something blindly. I there a way to regain a text console in order to inspect the kernel? I can connect a machine to the serial port if this will help - does sysrq work though the serial port? Which software should I use on the serial port (on the 'other' machine) for this purpose then? Thanks -- Eyal Lebedinsky (eyal@eyal.emu.id.au) - 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/