Created attachment 1091024 [details] System log from journalctl Description of problem: When a PC is left idle for some, after unlocking the UI all previously open windows are gone. Processes are actually terminated. Version-Release number of selected component (if applicable): compiz-mate-0.8.8-30.fc23.i686 lightdm-1.10.5-4.fc23.i686 How reproducible: Every time Steps to Reproduce: 1. Disable any form of power management from MATE (set "Put computer to sleep" to "Never"). 2. Open few windows (MATE Terminal, firefox...) 3. Leave a MATE session idle until the screen goes black. 4. Unlock the screen with your password. Actual results: All windows are gone. Expected results: All windows should be there - as it had always been before. Additional info: This is a MATE spin-off F23 i686 installed from Live CD, using mate-compiz-gtk. Video driver is nouveau. The processes are actually terminated (not just the GUI windows gone) - you can verify this by using ps. Moreover, the process shutdown is always unclean - do it twice with Firefox and it will show you the 'This is embarrassing' screen the second time - a clean indication that firefox did not exit gracefully. Additionally, when the screen is unlocked, the list of windows in panel shows a "Starting Compiz" button for a few seconds - just like it does when I log in for the first time. So, it may be that something (lightdm?) is crashing the whole window manager. The system log is attached (showing some interesting message regarding X.Org being unavailable).
Confirming that setting "Timeout until the screen blanks" in LightDM Greeter GTK Settings to "Never" works around the problem.
Hm, taking my last comment down - even this LightDM setting does not help with being away longer. Something simply kills most (all?) X things - but few somehow survive, e.g., if I have a VPN connected, it remains connected (maybe NM keeps this away from X?)
Turning off DPMS works around the problem, so it is clearly something that aggressively kills all GUI processes when it attempts to sleep the video subsystem: xset -dpms
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