I have connected two monitors to my graphics card: one is connected via DisplayPort to HDMI adapter and it works fine; the second is connected directly via DisplayPort and it isn't detected by my OS.
When I run
xrandr, I can see that DisplayPort is disconnected so my monitor was not detected. When I turn on the computer, Grub is displayed on both monitors, so this isn't a connection problem.
I read some posts on a forum, and as someone wrote I disabled DDC/CI in the monitor, but it didn't help. Could you give me some advice how to resolve this problem?
Graphics card: ATI FirePro V8700, card is detected correctly