Alt+Tab stopped working after upgrade to 12.10

Bug #1131361 reported by Gregor Mandel on 2013-02-21
This bug affects 1 person
Affects Status Importance Assigned to Milestone
compiz (Ubuntu)

Bug Description

I recently upgraded from PP to QQ which broke the ability to switch between running applications by pressing Alt+Tab.

The affected host is a ThinkPad X61s. I don't know if this is of any relevance but I think Unity/Compiz is running on/in LLVM.

Until now I tried several countermeasures in any combination imaginable to fix this:

1. bound, unbound and rebound the Settings/Keyboard/Shortcuts/Navigation/Switch applications key over and over again
2. massive amount of reboots
3. activated, deactivated, reactivated switchers and set, unset, reset plugins and their key bindings - even other ones as Alt+Tab - in ccsm under
  3.1 Unity Plugin
  3.2 Window Mgmt - Application switcher and Static application switcher
4. deactivated Alt as a hotkey for the HUD
5. even switching keyboard layouts

It may be worth mentioning that the Alt keys themselves are working as shown by xev. I can access the application menu, too. What makes me wonder is the fact that I can get the HUD by tapping Alt_R but not by pressing Alt_L (so I tried removing the HUD key binding which as stated didn't help). App switching itself is not possible using either Alt key.

This behaviour is the same using the internal keyboard as well as a bluetooth one.

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tags: added: bot-comment
Gregor Mandel (launghpad) wrote :

Probably compiz causing this

affects: ubuntu → compiz (Ubuntu)
Gregor Mandel (launghpad) wrote :

Alt+Tab wasn't fixed by 13.04. Nevertheless I stumbled upon the fact that Guest can still switch apps with Alt+Tab which makes me wonder even more. It stopped working under my main account with updating to 12.10 but guest is not affected. So there is an incompatibility only occurring under specific circumstances ...

Can anyone provide some tips how to debug further?

Neal McBurnett (nealmcb) wrote :

Is this a dup of bug 1169045? Do you have compiz-plugins installed?

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