From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 66F4820CCED; Wed, 7 May 2025 09:59:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=78.32.30.218 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746611980; cv=none; b=dgJRQtql+M85QdlfQvvp+1nS8sfLo1nlODZ17DiHp0oE/MaKTiRqz1d+MQEKwmmxGbWBzipQb59wVVOWYWaCFyM/n+9kd8LIRbsMdOQZOlmEJYJKkOHa2jeKLKuly/mi3oHG+yuyRFBN7GbRWbw2bXbIcJK7aQH58dNKMobPODA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746611980; c=relaxed/simple; bh=gkxsxk4kIRbZS/RFb2DMdp2h9xVzKhVdu8Vr0OBvkvw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UqnzVI4PTNnzfN1WgLNL9x3Pn/ikC7K8fMz9mAy0PY/xqY/OXSeQKVUphqvRdltHQpsKXWDc6a0hNbCqPXuqTzUY6S7c2hKOXg25n/A6m92M4hZYomPKj/gsJWTBhGx3JgZsjTHg6fmJ6ypkkQmfdyBJ0i0lFu0DGX652lzHhS0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk; spf=none smtp.mailfrom=armlinux.org.uk; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b=zz9OuMHw; arc=none smtp.client-ip=78.32.30.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="zz9OuMHw" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=cTmfRg21cWI2PwDlotQQ7qSHEOYsN+Bp4SVGVhQiy+4=; b=zz9OuMHwoF4QyEfMGd5qz+Z6nx Z/Z+d+tpBKlO8x/IlA13dgdFw7m12H1R9SSccDLUtQ4C9/9R1Y13qQCASjgeCNFAYrsh0reTr49sl /luEIrx4TDi/sbxVjhXmAq+aoJ2YUc68uy8uhwjUdvyURpDs2pXHlWotWqlLnflRbQnm666xAr8dE wNGyV+befkKSy5DlTh2osaQ8Niwz/tx0XxX9ZIaGDRTY5Vud4qoDN32ej488rnqMnjipy5cNoElf1 st1FeCsbkEnMMoVus/t3Ht3cLCI82IIndlPIG+54mtSs2OGkXk92pqZwbWegQFz+QS1+hIs41fKfW o2LpDKkA==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:37248) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uCbYj-0007LH-2Q; Wed, 07 May 2025 10:59:25 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.96) (envelope-from ) id 1uCbYf-0005gZ-21; Wed, 07 May 2025 10:59:21 +0100 Date: Wed, 7 May 2025 10:59:21 +0100 From: "Russell King (Oracle)" To: Maxime Chevallier , Linus Torvalds Cc: Andrew Lunn , Woojung Huh , Vladimir Oltean , Heiner Kallweit , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Dmitry Torokhov , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [BUG] Stuck key syndrome (was: Re: [PATCH net-next v2] net: dsa: microchip: Add SGMII port support to KSZ9477 switch) Message-ID: References: <20250507000911.14825-1-Tristram.Ha@microchip.com> <20250507094449.60885752@fedora.home> <20250507105457.25a3b9cb@fedora.home> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: Russell King (Oracle) On Wed, May 07, 2025 at 10:23:17AM +0100, Russell King (Oracle) wrote: > [Sorry for going off topic here - changed the Cc list, added Linus, > changed the subject.] > > On Wed, May 07, 2025 at 10:54:57AM +0200, Maxime Chevallier wrote: > > On Wed, 7 May 2025 09:31:48 +0100 > > "Russell King (Oracle)" wrote: > > > [rest of the email got deleted because Linux / X11 / KDE got confused > > > about the state the backspace key and decided it was going to be > > > continuously pressed and doing nothing except shutting the laptop > > > down would stop it.] > > > > Funny how I have the same exact issue on my laptop as well... > > I've had the "stuck key" behaviour with the HP Pavilion 15-au185sa > laptop I had previously (normally with ctrl-F keys). However, hitting > ctrl/shift/alt would stop it. > > This is the first time I've seen the behaviour with the Carbon X1 > laptop, but this was way more severe. No key would stop it. Trying to > move the focus using the trackpad/nipple had any effect. Meanwhile > the email was being deleted one character at a time. So I shut the > laptop lid causing it to suspend, and wondered what to do... on > re-opening the laptop, it didn't restart and is back to normal. > > This suggests that the entire input subsystem in the software stack > collapsed just after the backspace key was pressed, and Xorg never > saw the key-release event. So Xorg duitifully did its key-repeat > processing, causing the email to be deleted one character at a time. > > The problem is, not only did this destroy the email reply, but it > also destroyed my train of thought for the reply as well through > the panic of trying to stop the entire email being deleted. > > I don't think this is a hardware issue - I think there's a problem > in the input handling somewhere in the stack of kernel, Xorg, > whatever multiple input libraries make up modern systems, and KDE. > > I did check the logs. Nothing in the kernel messages that suggests > a problem. Nothing in Xorg's logs (which are difficult to tie up > because it doesn't use real timestamps that one can relate to real > time.) There's no longer any ~/.xsession-errors logfile for logging > the stuff below Xorg. > > I'm running Debian Stable here - kernel 6.1.0-34-amd64, X.Org X Server > 1.21.1.7, KDE Plasma (5.27.5, frameworks 5.103.0, QT 5.15.8). I'll also add that The Carbon X1, being a laptop, its built-in keyboard uses the i8042: [ 1.698156] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12 [ 1.698543] i8042: Warning: Keylock active [ 1.700170] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 1.700174] serio: i8042 AUX port at 0x60,0x64 irq 12 [ 1.700271] mousedev: PS/2 mouse device common for all mice [ 1.702951] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input0 I don't have the HP laptop with me to check what that was using. The mysterious thing is "Keylock active" - clearly it isn't because I can write this email typing on that very keyboard. However, I wonder if it needs i8042_unlock=1 to set I8042_CTR_IGNKEYLOCK. Unfortunately, it's probably going to take a year on the Carbon X1 to work out if this makes any difference. > Anyone else seeing this kind of behaviour - if so, what are you > using? > > -- > RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ > FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last! -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!