I have now updated to 1.4b2. Unfortunatey I could not see that 2D acceleration is working now. In the link I send you a short test program. For imx6-Apalis I still get values ob about 80 ms for the BitBLT/TransparentBLT/BitBlt sequence. I would expect values below 10ms.
Even worse: When the display works in full hd resolution I get strange pictures - maybe there is not enough memory. In SVGA resolution it is ok.
With BSP 1.3 the display was ok even in full hd.