Comment 4 for bug 810942

@Jiehong

Thanks, I got it.

You are using over-the-spot style input, but basically ibus-mode supports only the on-the-spot style, not the over-the-spot style. By default, ibus-mode doesn't handle backspace key unless preedit text is embedded in buffer text, so backspace key doesn't work with over-the-spot style.

If you want to use the over-the-spot style input, the following setting in ~/.emacs may help you to solve this problem:

(ibus-define-common-key [backspace] t)

Note that this setting might causes another problem because backspace key will always be sent to ibus-daemon even if unnecessary.