Any driver updates are contained in Apple software updates, which are upto date on my iMac.
I don't have any other issues with the GPU, and I had no issues with the previous version of Photoshop. This would suggest that it is the update to Photoshop that is causing the issue.
The question is how to resolve it.
Adobe moves more and more processing to the GPU as each update progresses.
@eddybaby wrote:
The question is how to resolve it.
You can roll back a version.
You can keep the GPU off.
You can put it on and suffer the issue again.
You can wait for Apple to fix the GPU bug.
You can blame Adobe which will do nothing to solve the problem.