Upon boot, am presented with blank screen

[AmEv]

I recently helped my brother upgrade his monitor setup and video card from an ASUS 750Ti and single Dell 3007WFP to the MSI RX 470 and two additional Dell SE198WFP on each side. (The 30" had its backlight die, another story for another time, so in the meantime, I've got a Samsung 2253LW in the menatime. I am still using the original dual-link DVI cable that came with the Dell monitor.) To hook up the side monitors, we used some HDMI-DVI cables. (I need to check if the cables are single-link or dual-link.) Installation and orientation setup was successful in Windows 10, but in Ubuntu, all that happens is it appears on the side monitors, duplicated, in 1024*768.

Originally, I thought it was the open-source drivers not communicating with the card properly, so I installed the AMDGPU-PRO drivers off of ATI's Web site. Unfortunately, not only did it not resolve the incorrect resolution/incorrect physical orientation issue, but now Unity is not loading correctly. I am able to right-click on a black desktop and open applications (such as a browser, which I'm doing right now), but I have no window decorations, and I am unable to move or resize the window.

Display settings under unity-system-settings only says that "internal display" is connected (laughable), doesn't say anything about the Samsung monitor, and provides no option to not mirror the Dell monitors.

Xrandr: xrandr: Failed to get size of gamma for output default Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768 default connected primary 1024x768+0+0 0mm x 0mm 1024x768 76.00* Xorg.0.log: http://pastebin.com/aytvJzVc

dmesg: http://pastebin.com/Akp2qQyP

lightdm.log: http://pastebin.com/RnEa6DEc

Recently, I tried the suggestion at http://askubuntu.com/questions/17381/unity-doesnt-load-no-launcher-no-dash-appears, and even reverted to the open-source driver, but that didn't resolve the issue.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1653321/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Brian Murray (brian-murray)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We appreciate the difficulties you are facing, but it would make more sense to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs#When%20not%20to%20file%20a%20bug.