I upgraded from 11.4 to 12.1. Nice many things are working.
Except the updates!!! Neither zypper nor yast work. I removed PackageKit as it was blocking the former two. Still no use. I donot know now how to update the system for patches and/or bug fixes.
I use KDE. (My laptop is Macbook Pro 7.1 with NVIDIA graphic card). It is not shutting down as well after the upgrading to 12.1. The screen flickers hundreds of times. But does not shut down. I have updated all Nvidia drivers and added Nvidia repos while upgrading.
zyper rr 12 I used it as it was mostly demanded when I upgraded from 11.4 to 12.1. Many packages of 11.4 which were installed already in the system like k3b, amarok, libav*, xine etc. were not there in packman. So, the zypper dup stopped before the installation. I had to add this repo. and re-run zypper dup. Only then it proceeded with installation.
zypper rr 23 (I just added later) because my microphone is not working after the 12.1 upgrade. I realized it while trying skype. I thought may be that will fix the issue. but it did not. So, I can remove it now, as it did not help.
I am using a direct internet connection without any proxy.
Even yast2 does not work. I am quite surprised. I googled for the solution and got some ideas that I should disable PackegeKit. I did it. Still, yast2 does not work.