display resolution problem with guest additions disk of virtual box 4.3.14

I apt-get dist-upgrade.
cannot change screen size from 800x600 or 1024x768?
is too small. my display is 1920x1200.

$ uname -a
Linux debian 3.14-2-amd64 #1 SMP Debian 3.14.15-2 (2014-08-09) x86_64 GNU/Linux

it is resolved. update to virtual box 4.3.15 and reinstall guest additions disk.
then, display resolution in the guest will be automatically adjusted.