[arch-general] does using kms mean that you're stick to a framebuffer with specific resolution that you can't change?

[Xeslaro]

  the maximum resolution of my laptop is 1366x768, that's also the
framebuffer size with kms enabled. the problem is when i attach a
monitor with resolution 1920x1080 to it, the video output is at the
top-left corner of the monitor. and i found myself unable to change
the framebuffer size, appending video= option to the kernel command
line doesn't take any effect. so, i wonder is there anyway to get a
framebuffer with resolution 1920x1080 so i can benefit from the big
monitor while still with kms enabled?

kernel version : 3.10.0+
graphic card : intel hd4000