[Qt-creator] Cannot display QML inside creator, works just fine outside it

[Nikos Chantziaras]

On 12/02/16 10:39, Hunger Tobias wrote:
> On Do, 2016-02-11 at 23:13 +0200, Nikos Chantziaras wrote:
>> When I run an application that displays a QQuickWidget outside of
>> Creator, everything is fine. However, when running it in Creator (with
>> or without debugger), the application freezes at the moment the
>> QQuickWidget is used, and I get this error in "Application Output":
>>
>>     Unrecognized OpenGL version
>>     Unrecognized OpenGL version
>>
>> I'm on Linux 64-bit, with Qt Creator 3.6.0.
>
> I had a similar problem before: Apparently some Linux graphics drivers lock up
> when two applications try to use GL at the same time:-/
>
> Your QML-using application is one program, and Qt Creator requires GL for the
> QMLProfiler/QMLDesigner and the Welcome plugin. The first two are only loaded on
> demand, but the Welcome page is shown directly. To prevent that, you can try to
> start Qt Creator with "-noload Welcome" options.
>
> If your application starts then without freezing Qt Creator, then you can try to
> experiment with your graphics drivers.
>
> You should get the same freezes by starting any two openGL applications at the
> same time (e.g. two instances of GLXgears).

Nope, -noload Welcome doesn't help. Also, I have no issues running 
multiple GL apps. I can launch multiple glxgears processes without issues.

I noticed that there's something else printed before the "unrecognized 
version" errors:

   libGL error: No matching fbConfigs or visuals found
   libGL error: failed to load driver: swrast
   Unrecognized OpenGL version
   Unrecognized OpenGL version

I'm on an NVidia GTX 980 Ti running driver version 352.63.