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When scrolling up through the history of screen session with ctrl+a ESC (the output in terminal), it only goes back a small number of lines.

How do I configure screen to keep (much) longer history? I'd like to configure this globally and permanently, not per session.

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This is going to depend on your window manager. Are you using Gnome? KDE? – Scott Wilson Mar 29 '12 at 13:22
@ScottWilson can you elaborate about the relation with the other window managers? – amotzg Mar 29 '12 at 13:44

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You can add 

defscrollback <numberOfLines>

to your $HOME/.screenrc file or to the more global /etc/screenrc

See the CUSTOMIZATION section of the screen manual page for more details about using this command, those files, and the files precedence.

Ubuntu screen's man page: http://manpages.ubuntu.com/manpages/precise/en/man1/screen.1.html

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