I just tested with /boot/vmlinuz-4.15.0-29-generic which from my laptop ( to replace install/vmlinuz with this file), it would be screen blur. If I use 4.15.0-32-generic, blur would disappear.
I just tested with /boot/vmlinuz- 4.15.0- 29-generic which from my laptop ( to replace install/vmlinuz with this file), it would be screen blur. If I use 4.15.0-32-generic, blur would disappear.