Was having no problems on 2 GPU's, so added two more. All devices recognized in aticonfig (and by ethminer). But now after initialising miner, the program aborts with this message:
[xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
Can anyone take a stab at what happened here and how to remedy the situation? Do I need to start from scratch and recreate DAG or something? (Ubuntu 14.04.3, 4x R9 280x toxic). Thanks.