Disable ugly background hook not working

[vincent-olivert-riera]

According to the instructions...

Or disable the background color completely in your .emacs.d/init.el:

(add-hook 'mmm-mode-hook
(lambda ()
(set-face-background 'mmm-default-submode-face nil)))

However, this does not work for me. I'm using the emacs package provided by Fedora 32, and it happens on a "normal" emacs, and also in spacemacs.

$ emacs --version
GNU Emacs 27.1
[snip]

$ grep -A3 "default background" ~/.emacs.d/init.el
;; disable ugly default background on vue-mode
(add-hook 'mmm-mode-hook
  (lambda ()
    (set-face-background 'mmm-default-submode-face nil)))

[kodi]

adding (custom-set-faces '(mmm-default-submode-face ((t (:background nil))))) into private config.el did the tick for me.

[2510]

Same problem, with emacs 27.1.
Replacing mmm-mode-hook with mmm-major-mode-hook solved problem.