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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 99CF4C11F69 for ; Fri, 2 Jul 2021 04:31:18 +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 5025461416 for ; Fri, 2 Jul 2021 04:31:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5025461416 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]:39196 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lzAph-0008NL-Co for qemu-devel@archiver.kernel.org; Fri, 02 Jul 2021 00:31:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49514) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lzAkZ-0008FH-2z for qemu-devel@nongnu.org; Fri, 02 Jul 2021 00:25:59 -0400 Received: from indium.canonical.com ([91.189.90.7]:42644) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lzAkU-0002QB-0G for qemu-devel@nongnu.org; Fri, 02 Jul 2021 00:25:58 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1lzAkO-00050k-Sp for ; Fri, 02 Jul 2021 04:25:49 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 088202E81BA for ; Fri, 2 Jul 2021 04:25:47 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Fri, 02 Jul 2021 04:17:29 -0000 From: Launchpad Bug Tracker <1858623@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Expired; 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: janitor th-huth theartlav X-Launchpad-Bug-Reporter: Artyom (theartlav) X-Launchpad-Bug-Modifier: Launchpad Janitor (janitor) References: <157839132261.5317.2350112240462311551.malonedeb@gac.canonical.com> Message-Id: <162519944919.31921.14558565411608000521.malone@loganberry.canonical.com> Subject: [Bug 1858623] Re: 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="c7d3f30bfe7d7b488c7f9d3c8d7880184b1d065e"; Instance="production" X-Launchpad-Hash: 750a8fa5ee15c78d1c96c77d6d1c85486b7394e1 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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" [Expired for QEMU because there has been no activity for 60 days.] ** Changed in: qemu Status: Incomplete =3D> Expired -- = 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: Expired 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