Add this on terminal and should be fine : export HSA_ENABLE_SDMA=0

Tried it. It didn't work. From what I have seen, this helps to initialize more than 4 gpus.

Can you use it like this? HSA_ENABLE_SDMA=0 ./tdxminer -a lyra2z -0 bla bla bla.... You get it, before the script to run the miner.

Woohoo! It works!

Quote

sudo HSA_ENABLE_SDMA=0 ~/Downloads/tdxminer-v0.2.2.2/tdxminer -a lyra2z -o stratum+tcp://eu.bsod.pw:2159 -u xxx -p x

All 4 are running fine. Thank you very much sayyiditow.

Are all 4 gpus mines?

Yes, all 4 are mining now.

Still looking for a way to decrease power without losing hashrate, though

What is hashrate of the rig?

Total: 24 Mh/s @ ~1050 w (socket)
6Mh/s per card.

http://i.imgur.com/Tw0Llye.jpg

Cool! What is motherboard and CPU you used?

where do you see tdp?