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=-0.8 required=3.0 tests=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 0756DC33C99 for ; Tue, 7 Jan 2020 11:21:25 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 CFD6E207E0 for ; Tue, 7 Jan 2020 11:21:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CFD6E207E0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:46768 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iomvK-0005Sj-Qr for qemu-devel@archiver.kernel.org; Tue, 07 Jan 2020 06:21:22 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51525) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iolth-0005xM-RJ for qemu-devel@nongnu.org; Tue, 07 Jan 2020 05:15:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ioltg-0008SI-E6 for qemu-devel@nongnu.org; Tue, 07 Jan 2020 05:15:37 -0500 Received: from indium.canonical.com ([91.189.90.7]:40888) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ioltg-0008RQ-6b for qemu-devel@nongnu.org; Tue, 07 Jan 2020 05:15:36 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1iolte-0008U0-SH for ; Tue, 07 Jan 2020 10:15:34 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id CFE892E805B for ; Tue, 7 Jan 2020 10:15:34 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 07 Jan 2020 10:02:02 -0000 From: Artyom <1858623@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: theartlav X-Launchpad-Bug-Reporter: Artyom (theartlav) X-Launchpad-Bug-Modifier: Artyom (theartlav) Message-Id: <157839132261.5317.2350112240462311551.malonedeb@gac.canonical.com> Subject: [Bug 1858623] [NEW] VNC outputs garbage in zlib mode X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="bceb5ef013b87ef7aafe0755545ceb689ca7ac60"; Instance="production-secrets-lazr.conf" X-Launchpad-Hash: 734500ca3a66b7e0e60892318635db6e3607779b X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 91.189.90.7 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1858623 <1858623@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Public bug reported: TL;DR: When QEMU is launched with VNC as the output and viewed with a client that defaults to zlib VNC encoding, the resulting output tends to accumulate artifacts. Reproduction: Launch QEMU (tried with versions 4.2.0 and 4.1.0 on Linux 64bit) with -vnc= 0.0.0.0:0 Connect to it with a VNC client that allows you to select encoding, i.e. Ul= traVNC. Set encoding to zlib (type 6), 32bit color. As screen content changes it starts accumulating artifacts. Almost certain = to appear if you open-close windows over a pattern. Does not seem to depend on guest used, but easier to reproduce with a GUI. Looks like this: https://orbides.org/img/vnc.png It appears to be a deflate glitch of some sort - all of the bad pixels are generated by length/distance codes. Can't narrow it down any more. ** Affects: qemu Importance: Undecided Status: New -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1858623 Title: VNC outputs garbage in zlib mode Status in QEMU: New Bug description: TL;DR: When QEMU is launched with VNC as the output and viewed with a client that defaults to zlib VNC encoding, the resulting output tends to accumulate artifacts. Reproduction: Launch QEMU (tried with versions 4.2.0 and 4.1.0 on Linux 64bit) with -v= nc 0.0.0.0:0 Connect to it with a VNC client that allows you to select encoding, i.e. = UltraVNC. Set encoding to zlib (type 6), 32bit color. As screen content changes it starts accumulating artifacts. Almost certai= n to appear if you open-close windows over a pattern. Does not seem to depend on guest used, but easier to reproduce with a GUI. Looks like this: https://orbides.org/img/vnc.png It appears to be a deflate glitch of some sort - all of the bad pixels are generated by length/distance codes. Can't narrow it down any more. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1858623/+subscriptions