I'm a frequent user of the USA Dvorak keyboard layout, but have the default QWERTY keyboard. Stuff works simply by adding the layout in the Keyboard settings in Ubuntu, and worked well in 11.04.
However, upon upgrading to 11.10, while I'm able to use Dvorak in normal session I'm stuck with QWERTY in Lock Screen. My Dvorak layout doesn't exist in lock screens. I even added a custom shortcut to initiate it, but no luck.
Any ideas and workarounds?
If you only have 1 keyboard layout, try adding a Qwerty english one too. That way when it locks you'll be shown the available keyboards, and you can simply change to the one of your choice.
Hope I helped.