The attachments only show radeon and amdgpu, but at the top of the bug you said it happens with i915 too. I wonder if you could please verify that, and if it happens with i915 then please attach data from that machine:
lspci -kv > lspci2.txt journalctl -b0 > journal2.txt If we can see the same bug occurring with i915 then we might be able to exclude one of the AMD drivers and would be left with only a single driver to blame then... -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-amdgpu in Ubuntu. https://bugs.launchpad.net/bugs/1923153 Title: Display output laggy from iGPU when operating on desktop with attaching AMD R7 430 graphic (dGPU) To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1923153/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
