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.
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https://bugs.launchpad.net/bugs/1780237
Title:
Screen switches off after successful lightdm login from suspend
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