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With ES 3.0 and up the GL_MAX_SAMPLES query is available and is guaranteed to be at least 4. With ES 2.0 there is no such query. While what we report from supportedSampleCounts() has little significance with OpenGL (for the window's color buffer it is anyway the QSurfaceFormat that decides, not QRhi), QRhi users such as Qt Quick may rely on supportedSampleCounts() returning real values and may, for example, warn if the value attempted to use is not in the supported list. (even if MSAA is fully functional) Avoid getting such warnings on a pure ES 2.0 implementation with 4x at least. Pick-to: 6.5 Fixes: QTBUG-120474 Change-Id: I8a34a8bc9ce37ce951fdf7794247e8db44435d41 Reviewed-by: Andy Nichols <andy.nichols@qt.io> (cherry picked from commit 520d755d324a32c97cb9e25b617e99d0ab93d666) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org> (cherry picked from commit 149da3331b3339dfda66437a1b62c98a43987ef7)