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Dear Anthony, It's been a couple of days since Eion sent his suggestions, so I'll assume that you are still looking for a solution. Here's my attempt at providing that! > The niggle that is after a short time the screen blanks (screensaver?) and > it appears at a glance as if the computer is not on, so on occasion it has > drained the battery and turned itself off. > ... > I am using Xubuntu 20.04 and (i think) LightDM GTK+ greeter- and yes i've > already tried messing with all the settings from the system menu, including > the one which has a slider saying 'Timeout until the screen blanks - which > is set to Never. That slider seems confusing! The right is 60 minutes, which seems like a reasonable maximum time, but the left is 'Never', which is... infinitely longer... so is the slider increasing to the left or the right!? After a fun forage around in the source code, exploring all the way down from lightdm-gtk-greeter-settings to lightdm-gtk-greeter and finally to Xlib, it turns out that that slider goes left to right, from 0 to 3600. Xlib has a function XSetScreensaver that accepts an integer for timeout: See https://www.x.org/releases/current/doc/man/man3/XSetScreenSaver.3.xhtml >> Timeout and interval are specified in seconds. A timeout of 0 >> disables the screen saver Thus, quite aside from these technical curiosities, my suspicion is that either: - That slider *looks* like it's at never, but it's actually just slightly to the right. That would explain your "after a short time". - Or, lightdm-gtk-greeter-settings is not saving your settings properly. In any case, run cat /etc/lightdm/lightdm-gtk-greeter.conf in a terminal window to find out the *true* value of that slider. And of course you can simply edit that file as sudo/root to make sure that you have the line screensaver-timeout = 0 in the [greeter] section. Thank you for providing me with the inspiration to try Xubuntu. The more I play around with Xfce the more I like it, and Xubuntu's configuration is lovely. I like it when a DE is responsive on 1GB of RAM and single-core virtualisation, courtesy of an Intel 8400! :) I hope this helps your problem! Best wishes, Sebastian Freenode: 'seabass' -- The Mailing List for the Devon & Cornwall LUG https://mailman.dcglug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq