I did the exact same thing on a recently-upgraded Jessie installation
and got the exact same results. I agree that there should be some kind
of timeout like the one for changing display resolution, and for the
same reason: unwittingly changing the setting to something inappropriate
can make it very difficult to change it back to something sane.
For anyone else who ends up in this situation, I bet there's a gsettings
command that could be run via a virtual terminal, but I don't know the
schema or key. Something like:
DISPLAY=':0.0' gsettings reset org.gnome.desktop.interface scaling-factor
but replace "org.gnome.desktop.interface scaling-factor" with the right
schema and key (because I'm pretty sure that isn't it, although it may
look like it). Perhaps someone more knowledgeable can elaborate (or fix
the bug)...
Thanks,
Alex Robbins
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