Radeon Settings Version - 2018.0925.2319.41966
Driver Packaging Version - 18.30.19.01-180925a-333766E-RadeonSoftwareAdrenalin
Provider - Advanced Micro Devices, Inc.
2D Driver Version - 126.96.36.1994
Direct3D® Version - 9.14.10.01359
OpenGL® Version - 24.20.11000.13541
OpenCL™ Version - 24.20.13019.1008
AMD Mantle Version - Not Available
AMD Mantle API Version - Not Available
AMD Audio Driver Version - 188.8.131.5228
Vulkan™ Driver Version - 2.0.49
Vulkan™ API Version - 1.1.77
In Device Manager, try manually uninstalling the AMD Audio driver and then hit "Scan for Hardware changes" which installs the driver again and see if it comes back without error.
If it still comes back with error, in Device Manager again go to AMD Audio and see if you can install the previous AMD Audio that worked by clicking on "Roll back Driver" and see if it starts showing correctly.
You can also in Device Manager install the AMD Driver from Windows by clicking on "Let me pick from a list of available drivers in my computer" which probably be an older one but it might start working correctly again instead of having to install a previous AMD Driver set.
Or you can unpack the AMD Driver set that did work and manually direct Device Manager to install the AMD Audio driver only from C:\AMD folder after uninstalling the AMD driver from the computer using Device Manager Uninstall.
RX480 + monitor LG 34UM68-P 34"
radeon-software-adrenalin-18.9.3 - no work
radeon-software-adrenalin-18.8.2 - Work fine
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Report this issue to AMD so they know about the bug. Then return to a driver you know worked. You can find a link for reporting in Radeon Settings.