[Solved] how to change resolution?

Hi, i am trying alpine on amd a8 7600 apu.
xf86-video-ati seems not working,
build and installed it manually, and
kernel update from edge repository.
now xorg and xfce4, tinywm works fine.
but resolution is 1360x768, i want change it to 1920x1080.

--
PS: oh ufw seems to be broken.

solved it:
https://askubuntu.com/questions/377937/how-to-set-a-custom-resolution