After upgrading to Ubuntu 17.10 my secondary screen cannot be detected anymore. I have an AMD Radeon HD 7700M card and my monitor is connected through HDMI or DisplayPort, neither connection works. In Ubuntu 17.04 I had the possibility to revert to an older kernel and then it worked, but now even that older kernel is not working anymore.

  • askubuntu.com/a/815592/692175
    – user692175
    Nov 1 '17 at 18:53
  • @MichaelBay, that driver does install but gives me a blank screen. Nov 3 '17 at 9:14
  • I'm having a similar issue with my laptop which has an AMD APU. Total dealbreaker for me. I need an external monitor to work. Digging around for a solution...
    – CptAJ
    Nov 8 '17 at 1:17

I have a Nvidia 340 driver for my G92 GeForce GTS250 graphics card. I had the monitor not detected the problem after a kernel upgrades from Kernel 4.10.0-42. I just tried out the open source driver and I don't know why but it works and I can get the full-screen showing. Before I had a big black band around the display. I don't know what problems I will have with the open source driver but if nothing serious goes I have to use it or go back to an older kernel. I am using Linux Mint 18.3. This is only a a possible work around if the original driver is proprietory. The open source doesn't take advantage of many of the features of the graphics card I understand. For my purposes I have a functioning monitor.

  • I regret to say that I too am confused. You seem to imply that the open-source driver fixes the problem that occurred with the display. If this is the case, then you haven't actually posed a question. And, this forum is only for questions related to Ubuntu. Questions relating to Linux Mint should be posted at unix.stackexchange.com or forums.linuxmint.com
    – CentaurusA
    Sep 1 '18 at 1:35
  • Welcome to Ask Ubuntu! I recommend to edit this answer to expand it with specific details about how to do this. (See also How do I write a good answer? for general advice about what sorts of answers are considered most valuable on Ask Ubuntu.) Sep 1 '18 at 2:13

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