During normal work (interneting, file copying, ...) I randomly logout and must relogin. It is very annoying. I have attached the system log which contain the information. notice the line "X server for display :0 terminated unexpectedly".
Your attachment got lost. Is this still problem? If it is, please attach dmesg after logout. I doubt this is a nouveau bug, but we can't handle this bug appropriate without some info.
We cannot do anything with this bug report without logs, so I'm closing it as INVALID. Please reopen when you find these log files ;).
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