Public bug reported:

 dpkg --list | grep linux-image
ii  linux-image-4.15.0-36-generic                   4.15.0-36.39                
                 amd64        Signed kernel image generic
ii  linux-image-4.15.0-38-generic                   4.15.0-38.41                
                     amd64        Signed kernel image generic
ii  linux-image-generic                             4.15.0.38.40                
                     amd64        Generic Linux kernel image
ii  linux-image-unsigned-4.14.59-041459-generic     4.14.59-041459.201807280929 
                     amd64        Linux kernel image for version 4.14.59 on 64 
bit x86 SMP


Booting from GRUB into 4.14.59 allows my two monitors to run at their native 
resolution, 2560x1440. Any newer kernel does not allow my two monitors to run 
at their native resolution, only allowing up to 1920x1200. 

uname -a

Linux blackbox 4.14.59-041459-generic #201807280929 SMP Sat Jul 28
09:32:10 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "xrandr_4.14.59.log"
   
https://bugs.launchpad.net/bugs/1799613/+attachment/5204715/+files/xrandr_4.14.59.log

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https://bugs.launchpad.net/bugs/1799613

Title:
  In kernel 4.14.59, monitor resolution is detected correctly. In
  kernels after that, they are not detected correctly.

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