Enabling 10-autohint.conf (symlinking in conf.avail) does not work, autohint is still switched off: $ fc-match '' autohint :autohint=False,True Similar problem is with 10-unhinted.conf. The breakage appeared due to commit 1aaf8b77 (fixing bug #17722), please take a look at it. The approach with mode="append" instead of mode="assign" works well with rgba and lcdfilter, because they have no default value. On the other hand, autohint and hinting have default values and hence the appended value comes second having no effect.
Fixed in git master. but with the different way. I've changed the target from "font" to "pattern". that would works in both cases, yours and the original bug.
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