omg, I has setting "GRUB_GFXMODE=800x600" in "/etc/default/grub",make 
update-grub
after reboot videomode not been set.
so after find that reason is line "gfxmode $linux_gfx_mode" in OS section at 
"/boot/grub/grub.cfg", after comment this line and save changer, video mode was 
seted successfully

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https://bugs.launchpad.net/bugs/1297979

Title:
  grub2 didn't set supported video mode with nvidia card

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