jedi-vim + supertab does not complete variables names?

Please bear with me if this is a newbie question — I am quite a newbie with jedi-vim. I have this on my .vimrc:

Plug 'ervandew/supertab'
    let g:SuperTabDefaultCompletionType = "context"
    let g:SuperTabContextDefaultCompletionType = "<c-x><c-o>"
    "let g:SuperTabRetainCompletionDuration = "session"
    let g:SuperTabLongestEnhanced = 1
    let g:SuperTabCrMapping = 0
    augroup Supertab
        autocmd!
        autocmd FileType text call SuperTabSetDefaultCompletionType("<c-n>")
        autocmd FileType tex call SuperTabSetDefaultCompletionType("<c-n>")
    augroup END
"
Plug 'davidhalter/jedi-vim'
    let g:jedi#auto_vim_configuration = 0
    autocmd FileType python setlocal completeopt-=preview
    let g:jedi#show_call_signatures = "2"

and while jedi-vim works ok for my editing in Python, it never suggest autocompletion on variables. For example, if I have

start_time = -1
if start_

and press TAB I have a "Omni completion" pattern not found error. What am I doing wrong? Commenting out or in let g:jedi#auto_vim_configuration = 0 did not change things.

Thanks!

[Rmano]

Ok — found it. I had a remnant autocmd around I do not know from where. Thanks a lot …

[blueyed]

Curiosly, it works with plain <kbd>C-n</kdb>…

That is Vim’s builtin keyword completion, which is different from omni-completion.