I have been dual booting my Dell all in one PC with pretty good results. I started with 12.1, and have upgraded to 12.2, and then 12.3. I have always had the same problem with any version. After 15-20 minutes, sometimes shorter, sometimes longer, the keyboard and mouse stop functioning, and then the system just shuts down. I have tried both 32 and 64 bit version.
If I boot using recovery mode, it does not reboot, but the video resolution is not the best.
From the Yast hardware information: nVidia VGA compatible controller,Unique key Vcu0.M5OXMVcPYK1