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

[Anthony Liguori <aliguori@linux.vnet.ibm.com>]

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