From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: VNC framebuffer block artefacts on qemu-kvm-0.12.1.1 Date: Wed, 6 Jan 2010 16:12:14 -0200 Message-ID: <20100106181214.GA30541@amt.cnet> References: <4B4364AE.8080509@siriusit.co.uk> <20100106135118.GA28640@amt.cnet> <4B44CF36.1090408@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Mark Cave-Ayland , Anthony Liguori , Yaniv Kaul , kvm@vger.kernel.org To: Anthony Liguori Return-path: Received: from mx1.redhat.com ([209.132.183.28]:7872 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755937Ab0AFSNt (ORCPT ); Wed, 6 Jan 2010 13:13:49 -0500 Content-Disposition: inline In-Reply-To: <4B44CF36.1090408@linux.vnet.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: On Wed, Jan 06, 2010 at 11:58:14AM -0600, Anthony Liguori wrote: > On 01/06/2010 07:51 AM, Marcelo Tosatti wrote: >> On Tue, Jan 05, 2010 at 04:11:26PM +0000, Mark Cave-Ayland wrote: >> >>> Hi all, >>> >>> Having just upgraded from kvm-85 to qemu-kvm-0.12.1.1 on one of our >>> servers, I've noticed that I am seeing block artefacts when connecting >>> using VNC to the graphical VGA console of a WinXP guest. >>> >>> Looking at the VNC output, what I am seeing is that instead of updating >>> some parts of the screen which require a redraw, they are just being >>> replaced by light grey blocks of around 16x16 pixels. Generally, but not >>> always, several of these blocks appear in a row. Moving the mouse over >>> the relevant sections of the screen causes them to be redrawn correctly. >>> >>> I've tried this using both the cirrus and vga drivers, switching between >>> 16/24/32 bit colour and also different resolutions and unfortunately the >>> effect still remains :( Is there anything else I can do to help try and >>> debug this? Again this is on an x86_64 Debian Lenny host with a 2.6.32.2 >>> kernel on Intel. >>> >> Mark, >> >> Can you confirm that reverting commit >> 02c2b87fff97e77a1f6033fb09f53afa267c0c1e fixes the problem? (patch >> attached). >> >> Anthony: its reproducible with upstream/tcg. > > Which vnc client is this? vncviewer and vinagre.