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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A0BBEB64D9 for ; Fri, 7 Jul 2023 01:49:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231911AbjGGBtD (ORCPT ); Thu, 6 Jul 2023 21:49:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231734AbjGGBtB (ORCPT ); Thu, 6 Jul 2023 21:49:01 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7EE251FC9; Thu, 6 Jul 2023 18:48:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Sender:Reply-To:Content-ID:Content-Description; bh=pEVMLSMYDQxRiJYG+rwHNMSmMLxLLc++koHVoQM60Xs=; b=FRPacSz5lBXg+xPeRhTVEM+ODm v1M2gKfoCg2XqXYWAKEW/qkg2X4r4FH+LulacIpki/1NJroJfDDn0LNMuNl04m6egzJ13U1zcaTnX JfYCwgq30s9DzrD2by8r3zVDgjEBMpcEktn6dXBNQcRw8nNJ1eRwTEv/eT8I08/5QkQSnZyoTWRhG 0jFN3bOQ5qRhAjuzcNbXGboVT148n5wEUcT6bmVysRdGMPB2UT2rXRs78U5iJ/JG9fciYVKvkummm 8RTOov6fmwpqINKNbV2zC3pQ1nZRtq0tw3f0ycnyesQWuLEsnpHHaDskdBk//ngLeguRvln2WkcoT aMpanIMg==; Received: from [2601:1c2:980:9ec0::2764] by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1qHaaX-003BLn-2T; Fri, 07 Jul 2023 01:48:49 +0000 Message-ID: <9e770151-698c-0efe-8ea2-495f1ae54931@infradead.org> Date: Thu, 6 Jul 2023 18:48:48 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: Fwd: unable to boot when monitor is attached Content-Language: en-US To: "Dr. David Alan Gilbert" , Bagas Sanjaya Cc: Greg Kroah-Hartman , Johan Hovold , primalmotion , Linux Kernel Mailing List , Linux USB References: <5eb57bfe-94a4-136b-497e-deeb31846db1@gmail.com> From: Randy Dunlap In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/6/23 17:45, Dr. David Alan Gilbert wrote: > * Bagas Sanjaya (bagasdotme@gmail.com) wrote: >> Hi, >> >> I notice a regression report on Bugzilla [1]. Quoting from it: >> >>> >>> In the latest 6.3 and 6.4, it is impossible for me to boot my laptop if my DELL U2720Q monitor is plugged in (USB-C). I have to unplug it, then boot. As soon as the first second of boot went through, I can plug in my monitor and there is no issue afterward. There is no issue waking up after suspend. Only when it boots. >>> >>> See the attached pictures of the trace. The trace itself seems random (at least to me :)). I tried several things, like removing any attached USB devices from the monitor built-in USB-hub, but that does not change anything. (there is a keyboard and trackpad attached). >> >> See Bugzilla for the full thread. >> >> Unfortunately, the reporter can only provide photos of kernel trace >> (as he doesn't have any other means to extract kernel logs, maybe >> connecting over serial helps; see Bugzilla for these attachments). > > I note the photos have 'crud' at the bottom; as if something interesting > is in the video ram; perhaps something is freaked out by this nice 4k > monitor and some useful data structures are ending up in video ram. > > (Also note it's a librem with pureboot) > > Dave > >> >> Anyway, I'm adding it to regzbot so that it doesn't fall through >> cracks unnoticed: >> >> #regzbot introduced: v6.1..v6.3 https://bugzilla.kernel.org/show_bug.cgi?id=217637 >> #regzbot title: unable to boot with Dell U2720Q monitor attached >> >> Thanks. >> >> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217637 So what are __pfx_worker_thread and __pfx_kthread? Where are they from? -- ~Randy