During experiments I've found that GF during initialization uses photon current video mode settings and setting photon's
 last video mode. It is not comfortable to wait while one mode is set and then another video mode which is set by 
application.

Another problem, If I switch video mode using GF's function gf_display_set_mode() it reconfigures photon to use last 
video mode, which was set by gf_display_set_mode(). So GF application needs to set original mode which was before.