I have 3 monitors, I have cable 1 VGA, HDMI and DVI to HDMI, but only two monitors happens work and how I can fix it?
The R7 240 can only support a maximum of two passive display connections, HDMI/VGA/DVI etc. For the third monitor you will need to use either a native displayport-displayport connection, or use a displayport - active adapter - HDMI/DVI connection.
What is the make and model of the R7 240 you are using? Most of them do not have a DP connection.
For a list of certified adapters please click here.
Please also take a moment to watch this video which will explain how to connect three monitors to a Radeon graphics card.
That's right, this card has no dp.
My solution is to connect the third monitor integrated video output, but since ubuntu is very difficult, especially when the native video is intel.
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