Default [Q] How to change display resolution in kernel.

ZTE Blade V has same CPU as my device (ZTE V817).
Then I got the kernel of Blade V from ZTE support site.

Blade V has display size 800x480.
But my device is 854x480.
When I compiled cyanogenmod, The display seem to be 800x480.

I had repack the boot.img and replace the kernel with the stock one.
The display back to normal with no notification bar.

Last. If it's possible.
How can I add fence support to the kernel source OR upgrading from 3.4.0 to 3.4.10