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Lately my computer is freezing a lot when I do the Alt + Tab combination in order to change window focus.

I don't have Compiz or anything like that. What could be causing the system to lock up like this?

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    try going to System > Preferences > Appearances > Visual Effects, and set them to None. Now see if it hangs. Also, please post your Ubuntu version, and graphics hardware. – theTuxRacer Nov 29 '10 at 16:53
  • Some apps will try to do work automatically when they lose or gain focus (e.g. auto-saving their state, or refreshing/updating based on changes in the filesystem). Is it possible you are making some apps work extra hard? Does the problem only occur when switching to or from specific apps? – z5h Nov 29 '10 at 18:50
  • I have the same problem, have just updated to 10.10, and has happened 3 times in about as many hours. Will post more details as I get them. – Joel Dec 16 '10 at 18:57
  • You don't have Compiz or anything like that? You have to say something about your system, or it's impossible to answer your question. – Jo-Erlend Schinstad Oct 24 '11 at 13:14
  • This question was closed as off-topic because it should be a bug report. – Flimm Jan 12 '13 at 9:18
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It is more likely to be a bug with Xorg/Xorg driver, if you can reproduce the freeze please open a bug report and if you have the skills try to debug it as described at https://wiki.ubuntu.com/DebuggingXorg .

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