Ah. `radeon` and `amdgpu` are trying to load together, that may not be helping:
george@ThinkPad-E465:~$ cat /var/log/Xorg.0.log.old | grep amdgpu [ 29.119] loading driver: amdgpu [ 29.119] (==) Matched amdgpu as autoconfigured driver 0 [ 29.119] (II) LoadModule: "amdgpu" [ 29.119] (II) Loading /usr/lib/xorg/modules/drivers/amdgpu_drv.so [ 29.143] (II) Module amdgpu: vendor="X.Org Foundation" All GPUs supported by the amdgpu kernel driver [ 29.235] (EE) AMDGPU(G0): amdgpu_device_initialize failed [ 29.610] (II) UnloadModule: "amdgpu" This is a fresh installation. I've never picked either driver, and nothing appears in Additional Drivers. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1780237 Title: Screen switches off after successful lightdm login from suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1780237/+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