From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]:48311 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752416Ab3IIMJz (ORCPT ); Mon, 9 Sep 2013 08:09:55 -0400 Message-ID: <522DBA8F.4090505@redhat.com> Date: Mon, 09 Sep 2013 14:09:51 +0200 From: Hans de Goede MIME-Version: 1.0 To: Frank Dierich CC: linux-media@vger.kernel.org, linux-usb Subject: Re: [Bug] 0ac8:0321 Vimicro generic vc0321 Camera is not working and causes crashes since 3.2 References: <522C618E.6020203@googlemail.com> In-Reply-To: <522C618E.6020203@googlemail.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Hi, On 09/08/2013 01:37 PM, Frank Dierich wrote: > Hi, > > I have an ASUS A8JP Notebook with Ubuntu 12.04 with the following build in webcam > > Bus 001 Device 004: ID 0ac8:0321 Z-Star Microelectronics Corp. Vimicro generic vc0321 Camera > > The camera is working nice with Cheese and kernels before 3.2. I have tested the following once 2.6.32.61, 2.6.33.20, 2.6.34.11, 2.6.35.14, 2.6.36.4, 2.6.37.6, 2.6.38.8, 2.6.39.4, 3.0.94, 3.1.10. In all later kernels I have tested (3.2.50, 3.4.60, 3.10.10, 3.11.0) Cheese shows for some seconds a green and noisy image and crashes then with a segmentation fault. > > On the web I found some bug reports very similar to my problem but no one of these leads to a solution. > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=677533 > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/990749 > > In the following i give some informations about my system which hopefully helps to find the problem. Thanks for the bug report, looking at the bug reports, they all report an error of -71 which is EPROTO, which typically means something is wrong at the USB level. And nothing has changed for the driver in question between 3.1 and 3.2 , so I believe this regression is caused by changes to the usb sub-system, likely changes to the EHCI driver. The best way forward with this is probably to bisect the problem, and then send a mail to linux-usb@vger.kernel.org about this. Please CC me on this mail. Regards, Hans