[Spice-devel] Spice console pixelated noise on display changes

[Mitja Mihelič]

On 14/06/2018 11:01, Frediano Ziglio wrote:
>> Hi,
>>
>> On Wed, Jun 13, 2018 at 10:11:00AM +0200, Mitja Mihelič wrote:
>>> Dear all,
>>>
>>> We are running the following setup:
>>> ovirt-engine host:
>>> - CentOS release 7.5.1804
>>> - ovirt-engine-4.1.9.1-1.el7.centos.noarch
>>> - spice-html5-0.1.7-1.el7.noarch
>>>
>>> We have noticed problems with the Spice console. When it opens
>>> and displays the information presented by the VM's console it
>>> is OK at first. But as soon as any part of the display changes,
>>> that part gets replaced by random pixelated noise.
>>> For example I open the console of a standard CentOS server.
>>> When I type something at the login prompt the text is invisible
>>> and random pixels are displayed at the position of the blinking
>>> cursor. Please see attached screenshot
>>> spice-1-login_typing_and_cursor_waiting.png.
>>>
>>> Please also see other the attached screenshots.
>>> Login prompt after VM reboot: spice-2-login_after_boot.png
>>> Login prompt after hitting Enter a few times: spice-3-login_2x_enter.png
>>>
>>> We have tried and succesfully reproduced the issue on OSX (Chrome, FF,
>>> Safari) and Windows (Chrome, FF).
>>> VNC works fine.
>> Does it work fine with remote-viewer?
>>
>> You could try different image compression too,
>> e.g image-compression=off
>> https://people.freedesktop.org/~teuf/spice-doc/html/ch03.html
>>
>> Cheers,
>>          toso
>>
>>> Why would this be happening? Help would be very much
>>> appreciated.
>>>
>>> Kind regards,
>>> Mitja
>>>
> I would also try to download a new version of spice-html5 and use
> it directly to see if the problem is fixed.
>
> Note that you can set image compression using libvirt like
>
>    <graphics type='spice' port='5901' autoport='no'>
>      <image compression='auto_glz'/>
>    </graphics>
>
> (note the "image" element inside "graphics").
>
> Frediano
Where would I set those options?

Mitja