My second monitor is not detected. "Displays" shows only one monitor. Both monitors work separately, just not in dual-monitor mode. With both cables plugged in, only the monitor connected to HDMI is detected. If I unplug the HDMI cable, the monitor on the DVI-D cable is detected. Both monitors are Dell 23".

Ubuntu 14.04.5, fresh install with all updates.

AMD A10-7870K APU with Radeon R7 graphics. I do not have a separate GPU card.

Using X.Org X server - AMD/ATI display driver wrapper from xserver-xorg-video-ati (open source, tested)

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