Desktop lockup (13.1 + KDE)

Hi all,

In early February this year I downloaded the openSUSE 13.1 iso for my 32-bit PC together with the requisite checksum to verify the download was correct, which it was. I then burned the iso to a DVD+RW using openSUSE 12.3 + K3B which completed successfully without any errors or warnings and used that to perform a fresh install of 13.1.

Since that time the system has suffered many soft lockups. Sometimes even the mouse pointer locks in place. As an example, on one past lockup the system switched to a black screen with some text on it, a part of which was:-

stuck for 22s! [Xorg:762]

Sometimes the number in the square brackets is 700.

Sometimes if the system is left for a few minutes it will revert to the login/password screen.

Does anyone know if the text that is displayed on the black screen after the lockup is saved into a log somewhere on the system ?
If so, where can I find that log ?

I think that much of the text on the black screen, that I can't remember at this point, may be useful in fixing this problem.

Thanks in advance for any help that you can give with this.

Stuart