Change Keyboard Layout login solved

[Thainop]

How can I change keyboard layout on Login/password page, from US English to US Dvorak?

Mint Main edition Daryna. It wast fine a week ago then revert back to US English today, I can't change it back (@ login). However, once Nautilus load, the layout automatically correct itself to Dvorak.

[Husse]

sudo gedit /etc/X11/xorg.conf

And find section "InputDevice" and change Option to:

Option "XkbLayout" "us Dvorak"

I'm not sure if it is called "us Dvorak" so please check first
This should work

[Thainop]

[Solved]
Thanks a lot Husse. Your instructions are great. It is corrected now.
Note: When I first change on xorg.conf , after boot up something like Gnome keyboard tried to change it back to US qwerty (for xkeyboard), but I didn't let it change. So the second time, it didn't ask me or try to change it back anymore. Everything stand as Dvorak as I want. Thanks.

[Thainop]

I have found a better command on xorg.conf . This change will not break gnome keyboard. So I do this:
Option "XkbLayout" "us"
Option "XkbVariant" "dvorak"

They are in the Section "InputDevice"