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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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closed as off topic by Marco Ceppi Feb 2 '12 at 3:42

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

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

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 .

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