I have tested xorg-server-hwe-18.04 2:1.20.8-2ubuntu2.1~18.04.1 in bionic-proposed and it can fix the issue.
I have tested xorg-server- hwe-18. 04 2:1.20. 8-2ubuntu2. 1~18.04. 1 in bionic-proposed and it can fix the issue.