It really looks like a hardware/driver failure. I something like that when I had an Intel-branded motherboard with a failing BIOS. When I changed the motherboard to another one, everything started to work perfectly. (and I changed it because it died while updating the BIOS :) )

On Wed, Jul 6, 2016 at 2:10 PM, Fazekas László <mneko@freemail.hu> wrote:
Hello Boud,

After some tests I think the problem is most likely not Krita but Compiz (over Mesa GL and I thing that's the real reason). Now I changed Compiz to Metacity, and no crash so far (crossing fingers). Krita only does something that generates the crash. And not only Krita: once the same happened when I started to play a video with Totem. Unfortunately it stops the computer immediately so I cannot make any dumps.

Thanks,
Fazek



2016-07-06 10:44 keltezéssel, Boudewijn Rempt írta:
On Wed, 6 Jul 2016, Boudewijn Rempt wrote:

If opengl isn't enabled, it's very unlikely to be a krita thing... Are you
using a home-built Krita? If so, does it also happen with the appimage? 
Er... You specified the ppa. Could you try the appimage in any case? Also,
maybe try with a clean config?

On Wed, 6 Jul 2016, Fazekas László wrote:

Hello,

I'm trying to use krita3-testing from Dmitry's ppa on a machine with the 
following parameters:

Ubuntu 16.04 64bits,
Intel dual core 2GHz cpu,
Intel 82945 built-in gpu.
Gnome flashback with Compiz, 1920x1080, one display.

On the computer everything works fine, but when I'm using Krita, the 
whole screen becomes full of flashing colorful noise sometimes. I'm not 
using OpenGL, that option is even grayed out in Krita.

This happens usually when I close a dialog window (file dialog, 
preferences etc.), or when I close a document.

Has anyone experience with this bug? Is it a Krita thing or something 
with the xorg driver? Or QT? Or just the weather is too hot here?

Fazek

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--
Dmitry Kazakov