I have installed ubuntu 14.04 as a dual boot OS on my Asus Chromebox and I'm a linux newbie.

Anyway, everything seems to be working fine except for the DisplayPort monitor not working. The Chromebox has two outputs - DisplayPort and HDMI. I have a HDMI -> DVI cable as well as a DisplayPort -> DVI adapter hooked to a DVI cable. Both monitors work fine in ChromeOS mode, but only the HDMI port works in Ubuntu mode.

I went to the display settings in ubuntu but only the HDMI-connected monitor is showing up. I have swapped the cables to hook into each different monitor but only the HDMI one works no matter the setup.

Also, if I only hook up the DisplayPort and boot into Ubuntu, it does show a little bit of text for a second before it goes into graphical mode and then the monitor loses signal. So I'm guessing it's a missing driver or something. Is there some way to see if I have a missing driver or something that would be needed to detect this second monitor?

Thanks

  • You can edit your question to add details like that, it's a little easier to follow that way. – kraxor Jun 21 '14 at 22:53

I had the exact same problem. I was using a passive DP to HDMI adapter which worked with Chrome but not Ubuntu or Arch. Switched to an active adapter and it came right up.

  • Same here, +1 for active adapter – Creek Sep 2 '15 at 20:42

I have the same, first tried with an active HP DP->DVI, and with a direct cable. Both don't work out of the box. You can force a connection like this:

xrandr --addmode DP1 1280x1024
xrandr --output DP1 --mode 1280x1024 --right-of HDMI1

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