Render in QOpenGLWidget is flipped about the y axis when render mode is wireframe and face culling is enabled on Linux.

The rendered triangle is flipped about the y axis when render mode is wireframe and face culling is enabled.

glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
glEnable(GL_CULL_FACE);

It only occurred when rendering with a QOpenGLWidget but it did not occur with the QOpenGLWindow. The render is correct when GL_CULL_FACE is disabled.  I have attached demo code when you run it you should see s1.png and when you switch to wireframe (view > show wireframe) you should see s2.png