Comment 89 for bug 1549455

Using simple test apps (lp:~gerboland/+junk/openglwindow & lp:~gerboland/+junk/qquickwindow-debug), it appears that yes Qt is using OpenGL 1.4 on X for both raw GL and QtQuick apps.

./qquickwindow-debug
Window format: QSurfaceFormat(version 2.0, options QFlags(), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior 2, swapInterval 1, profile 0)
Context format: QSurfaceFormat(version 1.4, options QFlags(0x4), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior 2, swapInterval 1, profile 0)
GLES: false

The "Context format: ... version 1.4" the thing to look for.

The EGL backend for Qt (X uses the GLX backend) is requiring OpenGl2 or greater (since that is what the Window is asking for), but the GLX backend seems to ignore that request, and just work.