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And if so, is there a way to "downgrade" to the regular kernel?

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Why would you want to downgrade? Performance is really not an issue. – Daniel Andersson Apr 28 '12 at 18:22
I am using an encryption software which isn't compatible with a PAE kernel. – user6004 Apr 28 '12 at 18:51
I wouldn't trust encryption software with an obviously incompetent implementation. – Ben Voigt Apr 28 '12 at 19:18
up vote 1 down vote accepted

There should be no issue having several kernels installed. In fact, to my knowledge it is standard practice to install newer kernel versions alongside the old versions, instead of overwriting the old kernel while it is running and thus risking ending up with a non-functioning system after next reboot.

One can see the application in always keeping a verified working kernel in place.

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