From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 8 Dec 2001 21:57:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 8 Dec 2001 21:56:57 -0500 Received: from mta02ps.bigpond.com ([144.135.25.134]:38104 "EHLO mta02ps.bigpond.com") by vger.kernel.org with ESMTP id ; Sat, 8 Dec 2001 21:56:40 -0500 Message-ID: <3C12D227.2595EEC1@yahoo.com> Date: Sun, 09 Dec 2001 13:53:27 +1100 From: YH Reply-To: yh86us@yahoo.com X-Mailer: Mozilla 4.76 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Re: device video0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I have a quickcam module linked to /dev/video0. It was fine to run modprobe char-major-81-0, but the /dev/video0 (major=81, minor=0) cannot be opened, the errno=19 (No such device). There was no error of loading module in /var/log/messages. My understand is that calling open() to open video0, the system invokes "modprobe char-major-81-0", if the module (alias char-major-81-0) can be loaded, the device should be opened. What was I missing here? How can I further diagnose it? System: Dell Pentium III, Kernel 2.4.2-2 in RH 7.1 (no permission problem, I am in both root and users. No problem with the USB and videodev module) Hardware: logitech quickcam express webcam (USB) (no problem running it on the Window of my dual-boot platform.) Thank you. yh