这个问题很有历史了，见http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=434180中的bug报告，里面有几句话提到了解决方法：
And the problem showed up from version 1.4.6. Current transitional
solution is changing the value of \"/FrontEnd/X11/Dynamic\" in
/etc/scim/config or ~/.scim/config from \"false\" to \"true\", which is
known to unfortunately break deadkeys usage in European keyboard layouts.
So this walk around is only recommend when such problem shows up. Seems
further investigation is required.
于是打开编辑~/.scim/config
gedit ~/.scim/config
找到：/FrontEnd/X11/Dynamic = false
改为：/FrontEnd/X11/Dynamic = true
然后重新启动X，在opera中肆意蹂躏了下键盘，暂时没有出现和以前一样突然不能输入的情况。
(不过注意哦，这个方法有个问题上面也说到了：“ which is known to unfortunately break deadkeys usage in European keyboard layouts. ”)
