From owner-svn-src-all@FreeBSD.ORG Wed Sep 3 14:34:42 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 9232E6C1; Wed, 3 Sep 2014 14:34:42 +0000 (UTC) Received: from mail-ie0-x234.google.com (mail-ie0-x234.google.com [IPv6:2607:f8b0:4001:c03::234]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 3A81311FA; Wed, 3 Sep 2014 14:34:42 +0000 (UTC) Received: by mail-ie0-f180.google.com with SMTP id rl12so9779869iec.39 for ; Wed, 03 Sep 2014 07:34:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=ZMGEXsTVvox03kySViY6Pq9luOyuxfX/dkVPjK/HsqE=; b=Fkqa0XJYsom8Qp8sEXjPAU//jDT/ilpxMZiq/GXp2DwK6Ojuvu42GrOedUHdOHYLnR hLzDGqPRKCzwioqXZhmuZFYG8igzUipnzgp2OLyyks4gY+1No60ip13rqpg+xpOYVXkx Jz+7ZjR9YEkvQTMTgYQFA1I+B3xUnYlMtByiQd4m3blfTO3mz9KDLgKZ8bWgN2/rT3Kx XLM9x9VJNqRXGH+vVXXLP0bkywEr/kAvAfCpaCEVLL85SV7C5Gjg5oUhyfwd0hYvqFyL I/7SWhN7d4DMLg0wIkzqUrPdpyy4/z7F1QKMnuPtLeN2Xqt0SZ7mt4BM0ZBcHu09JX1m cFdw== X-Received: by 10.43.136.134 with SMTP id ik6mr39008152icc.6.1409754881585; Wed, 03 Sep 2014 07:34:41 -0700 (PDT) MIME-Version: 1.0 Sender: carpeddiem@gmail.com Received: by 10.107.44.1 with HTTP; Wed, 3 Sep 2014 07:34:21 -0700 (PDT) In-Reply-To: <20140903140757.GA7494@FreeBSD.org> References: <201409031400.s83E0bK6049810@svn.freebsd.org> <20140903140757.GA7494@FreeBSD.org> From: Ed Maste Date: Wed, 3 Sep 2014 10:34:21 -0400 X-Google-Sender-Auth: mSSxTKBT5CaeCMUqJbl9pYcnXXc Message-ID: Subject: Re: svn commit: r271023 - stable/10/sys/dev/vt To: Alexey Dokuchaev Content-Type: text/plain; charset=UTF-8 Cc: svn-src-stable@freebsd.org, "svn-src-all@freebsd.org" , "src-committers@freebsd.org" , svn-src-stable-10@freebsd.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Sep 2014 14:34:42 -0000 On 3 September 2014 10:07, Alexey Dokuchaev wrote: > On Wed, Sep 03, 2014 at 02:00:37PM +0000, Ed Maste wrote: >> New Revision: 271023 >> URL: http://svnweb.freebsd.org/changeset/base/271023 >> >> Log: >> MFC r270280 by dumbbell: vt(4): Pause the flush timer while swithing window >> >> This fixes bad looking refresh when switching window: squares instead >> of text, flashing screen, and so on. In the worst case, vt_flush() came >> at a very inappropriate timing and the screen was not refreshed at all >> (leaving squares all over the place). >> >> This doesn't fix the flickering of the screen with vt_vga, because the >> sync signal is temporarily stopped and the video memory is cleared. > > Will this improve the current situation with switching ttys on the console? > Right now it takes considerable time to switch, and sometimes the image is > not properly restored. This should address the corruption on vt switch; I don't believe it will have an effect on the switching time. > I'm also wondering why on PowerPC vt(4) behaves much better (switching is > instant, no artifacts at all). The VGA vt(4) issues all stem from the relatively complex and arcane VGA hardware and a somewhat limited vt_vga implementation. Most of the issues have been sorted out in HEAD by dumbbell@ and those are in the pipeline to be merged.