From patchwork Thu May 13 00:37:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Maciej W. Rozycki" X-Patchwork-Id: 12254997 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=-5.2 required=3.0 tests=BAYES_00, 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 DBF0FC433ED for ; Thu, 13 May 2021 00:37:17 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 555826100A for ; Thu, 13 May 2021 00:37:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 555826100A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=orcam.me.uk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id EDDC26E5AB; Thu, 13 May 2021 00:37:15 +0000 (UTC) Received: from angie.orcam.me.uk (angie.orcam.me.uk [IPv6:2001:4190:8020::4]) by gabe.freedesktop.org (Postfix) with ESMTP id 494BD6E5AB for ; Thu, 13 May 2021 00:37:15 +0000 (UTC) Received: by angie.orcam.me.uk (Postfix, from userid 500) id 7E0FB92009D; Thu, 13 May 2021 02:37:13 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by angie.orcam.me.uk (Postfix) with ESMTP id 79B8D92009B; Thu, 13 May 2021 02:37:13 +0200 (CEST) Date: Thu, 13 May 2021 02:37:13 +0200 (CEST) From: "Maciej W. Rozycki" To: Greg Kroah-Hartman , Jiri Slaby Subject: [PATCH 0/3] VT_RESIZEX fixes Message-ID: User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fbdev@vger.kernel.org, Tetsuo Handa , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Martin Hostettler , Linus Torvalds , Peilin Ye Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi, I got to the bottom of the issue with VT_RESIZEX recently discussed and came up with this small patch series, fixing an additional issue that I originally thought might be broken VGA hardware emulation with my laptop, which however turned out to be intertwined with the original problem and also a regression introduced somewhat later. This had to become 1/3 then and to make backporting feasible I had to put a revert of the offending change from last Sep next, followed by a proper fix for the framebuffer issue the Sep change tried to address. See individual change descriptions for details. These have been verified with true VGA hardware (a Trident TVGA8900 ISA video adapter) using various combinations of `svgatextmode' and `setfont' command invocations to change both the VT size and the font size, and also switching between the text console and X11, both by starting/stopping the X server and by switching between VTs. All this to ensure bringing the behaviour of VGA text console back to correct operation as it used to be with Linux 2.6.18. A minor glitch observed was that when I called `svgatextmode' while running X11 the screen became garbled and upon a subsequent VT switch to a text console the machine locked up hard right away. This might require further attention, but is not itself a problem with this patch series or a regression. Please apply then. Maciej