show image of current buffer in frame buffer (/dev/fbX)

Hello, Is it possible to display in some way the current content of frame buffer ? I have some issue that on rendering to /dev/fb2 with one application (psplash), it goes to the correct output, but using another application (qt) it always goes to /dev/fb2 (even if I static link /dev/fb0 to /dev/fb2). I thought that if I can display the content of frame buffer, it will help me understand what's going wrong. Regards, Ran