Ibus eating cntl-space key

[Stuart McGraw]

On 07/22/2011 07:57 PM, Stuart McGraw wrote:
> In Emacs, the cntl-space key is important and
> I use it frequently.  Because it conflicts with 
> the use of cntl-space in Ibus to toggle Ibus
> on/off, I remapped alt-space to that function in 
> Ibus.  This worked well in Fedora-11 for several 
> years and in Fedora-15 after I first installed it.  
> It stopped working after an Ibus update but another 
> Ibus update that arrived shortly after fixed it 
> again.  After yet another Ibus update it is broken 
> again. :-(
> 
> Currently (ibus-1.3.99.20110714-11), if cntl-space is 
> assigned "Enable or Disable" in Ibus prefs, it works 
> as expected.  However, typing cntl-space in Emacs is
> not seen by Emacs (unsurprisingly -- I assume it was 
> intercepted by Ibus).
> 
> When I delete cntl-space in Ibus prefs and assign 
> alt-space instead, alt-space then toggles the IME 
> on/off as expected and cntl-space has no effect in 
> Ibus (also as expected).  However, cntl-space still 
> has no effect in Emacs (unexpected!).
> 
> Terminating Ibus results in cntl-space working in 
> Emacs again.
> 
> Is there some secret setting I am missing?  Should I 
> report a bug?

For closure, this was reported in
 https://bugzilla.redhat.com/show_bug.cgi?id=725494
and in there are instructions on how to fix temporarily
until a more permanent update is released.