From owner-freebsd-bugs@FreeBSD.ORG Sun Dec 19 02:10:10 2010 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 867BF1065673 for ; Sun, 19 Dec 2010 02:10:10 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 477668FC14 for ; Sun, 19 Dec 2010 02:10:10 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.4/8.14.4) with ESMTP id oBJ2AAIq027051 for ; Sun, 19 Dec 2010 02:10:10 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.4/8.14.4/Submit) id oBJ2AA3T027050; Sun, 19 Dec 2010 02:10:10 GMT (envelope-from gnats) Resent-Date: Sun, 19 Dec 2010 02:10:10 GMT Resent-Message-Id: <201012190210.oBJ2AA3T027050@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Tom Glinos Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DD38F106567A for ; Sun, 19 Dec 2010 02:07:26 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from red.freebsd.org (unknown [IPv6:2001:4f8:fff6::22]) by mx1.freebsd.org (Postfix) with ESMTP id CBE958FC12 for ; Sun, 19 Dec 2010 02:07:26 +0000 (UTC) Received: from red.freebsd.org (localhost [127.0.0.1]) by red.freebsd.org (8.14.4/8.14.4) with ESMTP id oBJ27QIN088576 for ; Sun, 19 Dec 2010 02:07:26 GMT (envelope-from nobody@red.freebsd.org) Received: (from nobody@localhost) by red.freebsd.org (8.14.4/8.14.4/Submit) id oBJ27Qdh088575; Sun, 19 Dec 2010 02:07:26 GMT (envelope-from nobody) Message-Id: <201012190207.oBJ27Qdh088575@red.freebsd.org> Date: Sun, 19 Dec 2010 02:07:26 GMT From: Tom Glinos To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/153289: Modem Ring Signal not reliably detected X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Dec 2010 02:10:10 -0000 >Number: 153289 >Category: kern >Synopsis: Modem Ring Signal not reliably detected >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Dec 19 02:10:09 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Tom Glinos >Release: 8.1 >Organization: U. of Toronto >Environment: FreeBSD atlas.jarnac.org 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:55:53 UTC 2010 root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386 >Description: Modem Ring Signal not reliably detected. >How-To-Repeat: On the hardware side, create a switch that toggles DTR to RI. Also DTR to DSR. On the software side, run a program to repeatedly scan the modem status register with a TIOCMGET ioctl A toggle of DTR to DSR is always detected. A toggle of DTR to RI is less than half the time detected. Tested against two different serial hardware, similar behaviour. The same code with same/similar hardware runs perfectly under LINUX. >Fix: Unknown at present. There are plenty of work arounds like changing the harware or OS but anyone still using a modem should be seeing this problem. >Release-Note: >Audit-Trail: >Unformatted: