GTX1070 can not work correctly

Hi,
My PC configure as:
CPU: i5-8400
GPU: GTX1070
OS: ubuntu16.04
When i install GTX1070 driver of Linux x64 (AMD64/EM64T) Display Driver,Its display resolution declines from 19201080 to 1600900.What’s wrong?

How did you install the driver?
Please run nvidia-bug-report.sh as root and attach the resulting .gz file to your post. Hovering the mouse over an existing post of yours will reveal a paperclip icon.
https://devtalk.nvidia.com/default/topic/1043347/announcements/attaching-files-to-forum-topics-posts/