Bug#928782: Buster s2ram resume screen sometimes shows last desktop session, instead of lock screen.

[hoxp18]

Package: gdm3
To: maintonly at bugs.debian.org
Subject: Buster s2ram resume screen sometimes shows last desktop 
session, instead of lock screen.
Package: gdm3
Version: 3.30.2-3 amd64

Dear maintainers,

On my amd64 (Kaby Lake) machine,
sometimes resume from suspend-to-ram shows
the last desktop session screen,
instead of lock screen.

Just hitting some key, lock screen appears, and since then
there is no problem.

Kaby Lake iGPU -> HDMI -> (recent) LCD.

This could be a potential security leakage issue, I guess.

However, I cannot find any suspicious/specific logs.

Hence.
* posting to maintonly, not BTS itself.
* gdm3 package is just my guess.

Regards