Comment 23 for bug 1768352

I can confirm the updated mate-screensaver fixes the issue (somehow). There is still maybe half-second blink of visible desktop when I disconnect an external monitor from HDMI port while the screen is locked. After that, the screen is properly locked. Still, the quick blink of desktop is a security issue and it might also be possible for a malicious hacker to insert a USB device which emulates keyboard and might kill the screensaver completely while the screen blinks.