Laptop previously ran opensuse 11.4, without issue.
Recently upgraded it to 12.1 using the DVD image upgrade. When the machine booted, where normally the kdm login manager appears, I got a very brief flash and then a console login prompt.
I hoped it was an issue already addressed, so ran yast’s online update from the console (actually a couple times, since some of the updates suggest rebooting).
Still getting the same behavior. Logging in as “root” and trying “etc/init.d/xdm restart” says its stopping and restarting kdm, and produces the same flicker, but nothing else. I can see kdm running using the usual tools (ps, or “pidof kdm”).
As root, doing “killall kdm && kdm” works fine though. I can then login as my normal user, and everything seems good (*).
Googling too many vaguely related hits (people with bad xorg settings, driver problems, etc). After manually restarting kdm, everything seems fine, so it doesn’t seem to be a driver issue. Both the 11.4 and the 12.1 installs used the nouveau driver (its not a NVidia driver issue).
I should probably also include that yes, the system is configured to boot into runlevel 5, which is in turn configured to start xdm, and appears to do so.
(*) Tangent footnote: not everything is good, I can no longer tap the touchpad to click, but that seems like a minor configuration issue, which I’m pursuing else where.