I have the Club Radeon R9 280 Royal King and two displays: 1x Benq GL2450 (with DVI and VGA connections) and 1x Benq GL2450HM (with HDMI, DVI and VGA connections). The latter is connected with a HDMI-cable and works fine (including sound). The first display GL2450 is not recognized when connected with a DVI cable from display to the R9 280 DVI output.
Even with the DVI cable connected to the DVI output of the motherboard it does not function (and I selected all possible video inputs at the monitor). It only seems to work when the display is connected with a VGA cable to the VGA output of the motherboard. How come?
Is it possible to connect both displays to the DVI and HDMI outputs of the R9 280 card simultaneously?
Is there some setting to be done in the R9 280 software and if so, how / where?