screen turns black after 10 minutes regarless of screensaver settings

The default screensaver waiting time in Tails is set to 30 minutes, nonetheless the screen turns black after 10 minutes at most.

Running xset -dpms s off fixes this behavior. We should fix that in the ISO somewhere…

Feature Branch: bugfix/disable-dpms

Original created by @tails on 5617 (Redmine)

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