@hoogw wrote: I solved the same problem by disable screen saver, disable any kind of standby. Teamviewer only connects when a monitor is attached and display is on, so to say screensaver or power save are the cause. As soon one uses the system, it wakes up, and so the display, and teamviewer does work again. i think it's because mainly teamviewer cannot wake up the screen, so if the screen went to standby mode, teamviewer will not initialize the display. the only fix i could find in this is to keep your display awake at all time. disable it from the power settings to never turn off display. ( Off course, you can turn off the power button on your monitor, but on unbuntu, you must disable screen saver and disble turn off display after 10 min, keep display on all time) This is the ultimate solution. Teamviewer DOES NOT need the monitor on to work. I leave my server's monitor off all the time unless I need to go to the basement to interact with it. When I'm done, I shut it off. I've been using it this way for many versions of TV. I just recently swapped out PCs for my new server and started getting this issue. On my old server with the same version of TV, it worked with the monitor always off. Going to try some of the things suggested in here but I can assure you that you do not need your monitor on for this to work.
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