My 12.3 upgrade on my laptop was successful except for this: it crashes on waking from sleep or suspend. It goes into sleep/suspend just fine (as far as I can tell) but on attempting to wake, something crashes and the screen starts flickering and flashing. It did not do this prior to the upgrade, sleep worked fine on 12.2 for me. What could be causing this issue?
You are not the only one with this issue.
http://forums.opensuse.org/english/get-technical-help-here/laptop/484309-crash-laptop-lid-close.html
I have been having this issue also.