From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45476C43603 for ; Mon, 9 Dec 2019 01:18:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 17BF020663 for ; Mon, 9 Dec 2019 01:18:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="K8aDITAf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726845AbfLIBSO (ORCPT ); Sun, 8 Dec 2019 20:18:14 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:50014 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726621AbfLIBSN (ORCPT ); Sun, 8 Dec 2019 20:18:13 -0500 Received: from pendragon.ideasonboard.com (81-175-216-236.bb.dnainternet.fi [81.175.216.236]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id C7A8299A; Mon, 9 Dec 2019 02:18:11 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1575854292; bh=gMGIeU4wtqaWFsz+sVHshUd1vNGh2FdFDnoFYEXXX+k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=K8aDITAfBI3X+2rvcxbb5UALevp2O0Ji52NzhGd8Qh1P3ASjsrwAFHf0qX6piQeyP G2yjoCbYTK6XK5g4WKk1leq0YD+42r4TrUsbKiS/IGkfjYE8S/OkXvY0BQgaeuzi7q 6/Zejz2tmtdXJU3IoIWVT556/j7f08KxiUDLf8yY= Date: Mon, 9 Dec 2019 03:18:04 +0200 From: Laurent Pinchart To: Jeffrin Jose Cc: mchehab@kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PROBLEM] uvcvideo: Failed to query (GET_INFO) UVC control Message-ID: <20191209011804.GM14311@pendragon.ideasonboard.com> References: <20191207182152.GB5280@debian> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20191207182152.GB5280@debian> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Jeffrin, On Sat, Dec 07, 2019 at 11:51:52PM +0530, Jeffrin Jose wrote: > hello, > > i get this output piece from "dmesg -l err" of kernel 5.4.2 > > > -------------------x---------------------------x------------------ > uvcvideo: Failed to query (GET_INFO) UVC control 6 on unit 1: -32 (exp. 1). > uvcvideo: Failed to query (GET_INFO) UVC control 7 on unit 1: -32 (exp. 1). > -------------------x----------------------------x----------------- > > Additional information: > Linux debian 5.4.2 #17 SMP Sat Dec 7 01:39:12 IST 2019 x86_64 GNU/Linux > > Relevant file: > drivers/media/usb/uvc/uvc_video.c Does the camera otherwise fail to operate correctly ? Was the problem present in older kernel versions, or did it appear with v5.4.2 ? Are the above messages output every time you plug the camera (or load the driver in case the camera is built in), or only randomly ? What is the exact camera model, and could you please send me the lsusb -v output for it (running as root if possible) ? -- Regards, Laurent Pinchart