I'm somewhat embarrassed to report that these frequent oopses which occured during the first day after upgrading Ubuntu have not reappeared. One possible explanation is that all these crashes triggered an automatic reboot without actually powering off the machine: could this possibly have left the graphic card in an unexpected state that persisted across soft-reboots and was responsible for these problems?
Anyway, after a proper hardware reset and reboot ten+ days ago these problems have not reappeared once. I would propose to close this issue as invalid/wontfix/nothing-to-see-here...
I'm somewhat embarrassed to report that these frequent oopses which occured during the first day after upgrading Ubuntu have not reappeared. One possible explanation is that all these crashes triggered an automatic reboot without actually powering off the machine: could this possibly have left the graphic card in an unexpected state that persisted across soft-reboots and was responsible for these problems?
Anyway, after a proper hardware reset and reboot ten+ days ago these problems have not reappeared once. I would propose to close this issue as invalid/ wontfix/ nothing- to-see- here...