weston demo lost focus after suspend & resume

Hi all, We meet a issue and reproduce it by running weston demo weston-eventdemo in Linux. After suspend (echo mem > /sys/power/state) and resume, the demo lost focus and key press cannot be received by this demo. If we use mouse to left click the console after resume, then it can repair and receive this key press again. Could anyone share any idea about solving this issue? We hope this console will not lost focus and can receive key event after that resume. Any idea would be greatly helpful for solving this problem. Thanks!