I think that fixed it. To add `amdgpu.dc=0`, you must edit your grub configuration
https://askubuntu.com/questions/1029517/amd-rx480-screen-flicker-after- update-to-18-04#1032198 >To do this, edit the file /etc/default/grub, for example using >sudoedit /etc/default/grub >Find the line beginning GRUB_CMDLINE_LINUX_DEFAULT and add the text >amdgpu.dc=0 between the double quotes (""). Leave any other parameters as they >are. For example, you may end up with a line like this: >GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.dc=0" >Save the file and exit, and then run >sudo update-grub >to write the configuration, and reboot. After doing this, the resolution is detected correctly and appears normal in the 4.15.0-38-generic kernel. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. Status in linux package in Ubuntu: Confirmed Status in xorg package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1799613/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
