I found a nasty bug when I migrated all my kit to LM MATE 19 last week. I found that my personal home setup 2 of my LM19 workstations would unlock by themselves and I was not able to lock them unless I killed and restarted mate-screensaver. mate-screensaver (1.20.0-1) was still running so it wasn't defunct or zombied, just not responding to a manual lock or to the inactivity timeout.
I finally narrowed it down to when I shut down my Win10 gaming box and the Lindy USB/HDMI KVM will send a monitor shutdown command to all the devices plugged into it.
After much Googling I found this bug:
https://bugs.launchpad.net/ubuntu/+sour ... ug/1768352
The issue has been found and patched in Ubuntu 18.10, but they are still dilly dallying being cautious about pushing into 18.04...
So as a short term mitigation I tried the Cosmic version of mate-screensaver and mate-screensaver-common (1.20.2-1) and that seems to have fixed the problem.
I've tested it on 3 different machines so far (only amd64 I'm afraid).
If you want to avoid someone easily bypassing your screensaver lock by switching off and on your monitor download the following:
mate-screensaver (1.20.2-1)
mate-screensaver-common (1.20.2-1)
from the Ubuntu 18.10 (Cosmic) repo:
https://launchpad.net/ubuntu/disco/+pac ... creensaver
Then install with (example of install the amd64 version):
Code: Select all
sudo dpkg -i mate-screensaver-common_1.20.2-1_all.deb mate-screensaver_1.20.2-1_amd64.deb
Once they have pushed the fixed packages into 18.04 I plan to reinstall the proper packages with:
Code: Select all
sudo apt install --reinstall mate-screensaver-common mate-screensaver
Mithren