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Somehow (I have no idea how) I broke my ALT + TAB functionality. I'm using Linux Mint (MATE edition), and when I press ALT + TAB instead of switching to another application it very briefly shows the desktop, then returns me back to the application I was on.

I've tried enabling and disabling both the "Application Switcher" and "Static Application Switcher" in the CompizConfig, but neither has any effect. Even if both are disabled, I still get the same "briefly show the desktop then return to the original app" behavior.

This made me think that I somehow had rebound my ALT + TAB keybinding, but when I go to Keyboard Shortcuts it does show "Move between windows, using a popup window" set to ALT + TAB. If I change it (eg. to CTRL + ALT + A) the "show desktop briefly" behavior goes away ... unless I then do CTRL + ALT + A, in which case that behavior returns.

So in summary:

  • I have a keybinding for ALT + TAB to "Move between windows, using a popup window", and this binding appears to trigger the "show desktop briefly" behavior even if I change it to a different binding
  • I previously had "Static Application Switcher" enabled in CompizConfig, but whether I enable it, "Application Switcher", or none of the above, I see the same behavior

Thus, it seems I've somehow actually broken the "Move between windows, using a popup window" functionality, completely independent of Compiz ... and I have no idea how I can restore it.

Does anyone have any suggestions?

  • I am having the same issue – BenjB Oct 28 '18 at 18:24
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I had same issue. Disabling "software compositing window manager" worked for me:

https://makandracards.com/makandra/47066-ubuntu-mate-fixing-alt-+-tab-being-really-slow

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