[MacTUG] Screen unlocking bug in Mojave

[Glenn Anderson]

Hi Jim,

I did a search and found that there were people reporting issues with DisplayLink and the beta version of 10.14.4 that sound somewhat similar. The version of DisplayLink that was mentioned was 5, but not sure if it is the latest one.

The latest DisplayLink software is 5.1 https://www.displaylink.com/downloads/file?id=1302



On Apr 1, 2019, at 2:31 PM, Jim Johnston <jjohnston at uwaterloo.ca<mailto:jjohnston at uwaterloo.ca>> wrote:

Just wondering if anyone has run into this yet:

  *   I have a new MacBook Pro running 10.14.4 (bug first noticed under 10.14.3)
  *   A Targus USB3c + 2 x DisplayPort dock (using most recent DiplayLink drivers)
  *   2 Dell monitors connected over DisplayPort
  *   When I wake up the laptop all 3 screens wake-up (after 1-10 seconds) and the password prompt shows up on one screen (typically the screen where focus was last asserted before screen lock).
  *   If I explicitly locked the screen or put it to sleep, all 3 screens come up blanked and only the prompt is visible.
  *   If the laptop goes to sleep on its own, **sometimes all 3 screens wake up not blanked and all apps on the two screens that don't have the password challenge are fully accessible.
  *   It doesn't seem to matter on which screen the task bar or password box appears (i.e. I've had the insecure unlock on all three screens at some time).
  *   I've tried various apps left with focus (fullscreen, window and minimized) and haven't found the triggering app yet.


**This is only semi-reproducible: I tried it > 20x while writing this and everything worked fine.  During the entire morning, I got the insecure state at least 10 times in a row, since I was demonstrating it.  It's been happening for more than a week where it switches between (in)secure states for a few hours at a time.  I'm still looking for other contributing factors and triggers.

Jim
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