Re: VNC framebuffer block artefacts on qemu-kvm-0.12.1.1

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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?

Regards,

Anthony Liguori
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