minicom 光标乱跳 应该是有输出 但没有显示 各位大神指点下

系统为debian 9 stretch minicom 没有显示呀，各位大神
sudo dmesg | grep usbserial
[ 9.812076] usbcore: registered new interface driver usbserial
[ 9.812087] usbcore: registered new interface driver usbserial_generic
[ 9.812096] usbserial: USB Serial support registered for generic
[ 9.821719] usbserial: USB Serial support registered for ch341-uart
配置好后打开光标乱跳，除了显示minicom 2.7 不显示任何信息呀