Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 24 Sep 2002 09:06:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 24 Sep 2002 09:06:04 -0400 Received: from syr-24-92-226-125.nyroc.rr.com ([24.92.226.125]:46883 "EHLO mailout6-0.nyroc.rr.com") by vger.kernel.org with ESMTP id ; Tue, 24 Sep 2002 09:06:03 -0400 Subject: Polling /proc/apm causes usb hiccups and clock drift From: James D Strandboge To: Linux Kernel Mailing List Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.8 Date: 24 Sep 2002 09:12:00 -0400 Message-Id: <1032873120.3056.7.camel@sirius.strandboge.cxm> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1216 Lines: 33 I recently purchased a usb webcam and found that polling /proc/apm causes the webcam in xawtv to skip. I can do this either by doing 'cat /proc/apm' or using the gnome battstat-applet. Syslog says: Sep 23 10:14:17 sirius kernel: usb-uhci.c: iso_find_start: gap in seamless isochronous scheduling Sep 23 10:14:18 sirius kernel: quickcam: too little data by 48260 Sep 23 10:14:18 sirius kernel: quickcam: failed qc_imag_convert()=-90 Disabling the battstat-applet and not touching /proc/apm lets xawtv work fine without the above errors. Polling /proc/apm also causes clock drift. I have a Dell Inspiron 8200 laptop (1.6Ghz Pentium 4). Using kernel 2.4.18-686 from debian. I read that this happened to people in the 2.2 series. Is this a kernel apm bug or BIOS problem? Do I just have to live with it? Thanks, Jamie Strandboge -- Email: jstrand1@rochester.rr.com GPG/PGP ID: 26384A3A Fingerprint: D9FF DF4A 2D46 A353 A289 E8F5 AA75 DCBE 2638 4A3A - 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/