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Journeyman III

AMD Embedded R-Series RX-421BD Radeon R7 system locks up when trying to boot Ubuntu.

I'm new to this community and hoping to get some help from the experts here. We recently bought an AMD Embedded R-Series RX-421BD Radeon R7 (Merlin Falcon) board. We have Opensuse 42.2 and Ubuntu 16.04.1 LTS as dual boot. Every time booting ubuntu, it locks the system (the fan, led lights on the board is on, but the display doesn't work, nothing shows on the monitor). This problem goes away if 'nomodeset' is set in the grub before booting into Ubuntu. And this happens only when booting into Ubuntu. Any thoughts, leads or help on how to overcome this problem is greatly appreciated. Thanks in advance.