Public bug reported:

Binary package hint: xorg

(Report https://bugs.edge.launchpad.net/ubuntu/+source/xorg/+bug/196277
used to cover two separate but similar looking bugs. We split them now,
and here we describe one of the two bugs. The other bug has to do with
autologin, which when enabled, ignores any keyboard layout settings that
have been configured in GNOME, the graphical interface).

In the keyboard layout preferences, you can set "Both alt keys together
change layout", which worked in Gutsy for toggling between keyboard
layouts.

Currently:
* "both alt keys..." does not toggle keyboard layouts
* "both ctrl keys..." does not toggle keyboard layouts
* "both shift keys..." works fine
* "Alt+shift" works fine

Steps to reproduce it are:
* Visit System->Preferences->Keyboard-Layouts
* Press Add and add a new layout.
* Close preferences.
* Open Text Editor or whatever you want and write something with Double-Alts it 
switch layout and writes with the other layout
OK till now.
* Reboot.
* Open a text editor and try to switch layout... Boom! It doesn't work!

Temporary Workaround. Open Layouts again and remove/add the second
layout to start working again.

another workaround using a script:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/196277/comments/60

The text in the applet will change, to make it appear to be setting the correct 
layout, but the changes do not take effect.
Actually shortcut doesn't work at all, I set to be alts toggle in keyboard 
preferences, and it doesn't work, another thing is that even with keyboard 
indicator applet you change language, it doesn't changes, name in the applet 
changes, but it doesn't work. I need to open keyboard preferences, layout 
options, remove the tick and then put it back on keyboard layout switching 
shortcut.. As I said, shortcut doesn't work after this, but applet starts to 
change the layout, not only letters on itself.

This issue has been sufficiently confirmed. Please do not comment on
this bug unless you have some information that will help solve the bug.

[Background]
Both Canonical and upstream are aware of this issue and consider it of high 
importance. Unfortunately, the root cause is not something that can be easily 
fixed.

The issue is that to solve this problem, we need to have a way to save
the ExplicitVModMapMask, which is tracked okay in memory but not when
the configuration is passed via XKM binary files, because the XKM binary
file format simply doesn't have a field for storing the VModMask flag
data. The XKM file format allows only 8 flags to be set, and there are
already 8 defined. See the upstream bug report for details:
https://bugs.freedesktop.org/show_bug.cgi?id=4927

Upstream's proposed solution to the problem is to remove the xkbcomp
design and the xkm file format entirely, and switch to new X input
technologies. This will be a fairly sizeable re-architecting effort, and
will take time to complete. If you would like to help contribute to this
solution for this problem, please work with Sergey Udaltsov.

** Affects: xorg-server
     Importance: Unknown
         Status: Confirmed

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Bug watch added: freedesktop.org Bugzilla #4927
   https://bugs.freedesktop.org/show_bug.cgi?id=4927

** Also affects: xorg-server via
   https://bugs.freedesktop.org/show_bug.cgi?id=4927
   Importance: Unknown
       Status: Unknown

** Changed in: xorg (Ubuntu)
       Status: New => Confirmed

-- 
keyboard layout switching shortcuts like Alt+Alt do not work anymore
https://bugs.launchpad.net/bugs/251443
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