Also please clarify: "the touchscreen just doesn't render" implies that nothing is visible. Hence no information has been exposed until after "sudo loginctl unlock-sessions"? If that's the case then there would be no security issue.
Also please clarify: "the touchscreen just doesn't render" implies that nothing is visible. Hence no information has been exposed until after "sudo loginctl unlock-sessions"? If that's the case then there would be no security issue.