I'm trying to get work auto-complete. I've installed the package from MELPA successfully. However, it just does not work. When I enable auto-complete-mode the mode seems to be active (I see AC in the list of minor modes), but there is no pop-up window displaying completions when I enter some text.

I thought that it should work out-of-box, but may be it's not the case. I cannot find instructions how to configure the package installed via package manager, not manually. What actions should I undertake?

1 Answer 1


Package installation isn't intended to enable packages. Rather, installation makes code available for use. So some config is generally required for non-trivial packages.

Fortunately, auto-complete comes with auto-complete-config, so you might try initialization code like the following:

(require 'auto-complete-config)
(global-auto-complete-mode t)
(set-default 'ac-sources
  • Is it normal that I should wait 3-4 seconds for the menu? Can I set time of this delay or maybe my computer is really slow ;-) Commented Nov 16, 2014 at 14:50
  • This has little to do with the initial question, please open a new one for this issue.
    – wasamasa
    Commented Nov 16, 2014 at 15:53
  • @Mark Try M-x customize-group RET auto-complete RET and have a read through the manual.
    – sanityinc
    Commented Nov 16, 2014 at 16:01
  • What is principal difference between (set-default 'ac-sources ...) and (ac-config-default)? Commented Nov 16, 2014 at 20:01
  • Haven't looked at the latter, but it probably sets up a slightly different list of sources, so you could probably use whichever you prefer.
    – sanityinc
    Commented Nov 16, 2014 at 21:12

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