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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 BF113C47255 for ; Mon, 11 May 2020 20:11:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 994DD206F5 for ; Mon, 11 May 2020 20:11:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Xq9xDG1T" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729329AbgEKULW (ORCPT ); Mon, 11 May 2020 16:11:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36426 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729215AbgEKULW (ORCPT ); Mon, 11 May 2020 16:11:22 -0400 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2DF0C061A0C for ; Mon, 11 May 2020 13:11:21 -0700 (PDT) Received: by mail-pg1-x52d.google.com with SMTP id u5so2450161pgn.5 for ; Mon, 11 May 2020 13:11:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=aGREpUTYyj4dfAbnE/mFKF+b3GK7anik84D3UKfa8E4=; b=Xq9xDG1Tq3MMro7jMrqHTgHzFqucRUuPgZ+gdI2LaSv36V+liddm791yXz+Dc9aHKc MZahgCMOOXZ2xYymVDETWh3vGhGZ8aF6cI4BxTIRH7bRbz6YDtBOOyrQ87Bbg/qwXvs/ r6FblgySeF2vn5XrwF3yGA8LPAiTlXC0ORyerqj7v3FUVEn22Fe+/yMAsqW5Wa3bp2Tr hn+YDFLh9LoXBwLIs8Uv5zrXgJl2Sd17JeDr6COXXG27DidnyJXh0RFKjLS2GMGkfFVp a93dmj0xPsYRoMMVj26brQAmiqjb5BnNgTy64vG/HrTkM6lXTP0gE0VH7Cd/+zVWmHsZ mSiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=aGREpUTYyj4dfAbnE/mFKF+b3GK7anik84D3UKfa8E4=; b=eVDR9qN70wHS2x6jhG1kYMgbmRb/ShAIdvmjwpFVxCGZRiSoNFRYBl66HTRF1R3j9C PkBYfXo2Wh1vOK0PuhH392odXZFmwWPA0jJ2cGk+C/jA63l0bP62igoFYrkZpt8+kkk+ OOlBlaZGtIEZQsKZUFhIB2sekZ6GHB2NRqFvmiU5bVLVLBLOUEb+qNNTfLYBsk3wUqFI oKLzG1kAw3Ysjh4UzUKgKtKf5BEVxSxiVxgnNry/bwaDSD2grGE+bkpZlVKZ8Tj0pC1n qEmwtXNeGAoOpB8FFyLHSKMionHnZcHLaPrLgJDZiduab3dDm6ywPOawlZ8/XvBR0qUf kDag== X-Gm-Message-State: AGi0PuZdhmQA4GinrISIfykz7lnRmKgY9H7BDU7JVO247irwCDzZW9K9 k0hbKhexdRe6jKt66AjamnmngDnJ X-Google-Smtp-Source: APiQypJYv+X4gKjvakQI9F8vNRjqDyIZFVsovlWIOjRT8jH2yujrsjqC6QprazgWW9arw6b2ZDdLVQ== X-Received: by 2002:a62:520f:: with SMTP id g15mr17102365pfb.127.1589227881167; Mon, 11 May 2020 13:11:21 -0700 (PDT) Received: from dtor-ws ([2620:15c:202:201:3c2a:73a9:c2cf:7f45]) by smtp.gmail.com with ESMTPSA id g6sm10761935pjx.48.2020.05.11.13.11.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2020 13:11:20 -0700 (PDT) Date: Mon, 11 May 2020 13:11:18 -0700 From: Dmitry Torokhov To: Yariv Cc: linux-input@vger.kernel.org Subject: Re: PROBLEM: Apple external Trackpad event timestamps are jittery (regression) Message-ID: <20200511201118.GW89269@dtor-ws> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Hi, On Mon, May 11, 2020 at 09:18:15AM +0300, Yariv wrote: > Using a vanilla installation of Ubuntu 20.04 (kernel v5.4), the > timestamps of input events from my Apple "Magic Trackpad" - 1st > generation, connected over Bluetooth - are jittery. > This is a kernel regression. I bisected the bug. Do you see the same jitter when connected over USB? Can you also see if there is similar jitter when you parse timestamps of SYN_RPEORT events from "evtest"? Could you post a sample of events generated by device (via evtest)? Thanks! -- Dmitry