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My Lubuntu font size suddenly turned extremely tiny (upper case characters are 4 pixels high) for some reason. The only possible change I can think of is I turned on desktop sharing (vino) in the session settings. The system fonts is Ubuntu 11. How can I fix it?

Changing system font size actually doesn't do anything at all. Texts are still 4 pixels high.

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websites are ok... it's just affecting desktop fonts – xster Dec 10 '12 at 5:32

Strange that my DPI got changed mid-use...

Fixed it with:

Option         "UseEdidDpi" "False"
Option         "DPI" "168 x 168"

in xorg.conf

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