(In reply to comment #34)
> Hi,
> Same issue with my system on motherboard MSI A78M-E35 with AMD APU A4-5300.
> But my system reboots some 3 seconds after initramfs is loaded. So no Xorg
> and no logs.
> 

You have an APU.  This bug is specifically about dpm on BTC discrete GPUs.  It
sounds like you are seeing bug 72921.  Please try the patch on that bug.