I recently noticed that I'd somehow (suddenly) I lost my scrubby zoom—checked Preferences>Performance and, sure enough, Photoshop was no longer detecting the graphics processor (option to select is deactivated). I've been troubleshooting for several hours now without any progress. I'm running Windows 10.0.19042 on a Microsoft Surface Book 2. I did notice that there were Photoshop and Nvidia updates to be installed, so I did that. The Photoshop update made things WORSE — at least with the older version I could open and work on images. With the latest version (22.3) I get a nasty error message as soon as I try to open an image, and then the program crashes (screenshot of error message attached).
I'm having the exact same problem with a different Nvidia graphics card. Photoshop worked fine yesterday but after upgrading it today, I can't open anything without it crashing. My partner works in IT and spent over an hour troubleshooting to no avail.
Ironically, it's good news for the people experiencing the issue as it will definitely have to be addressed as a priority, so look for V22.4 and fingers crossed it won't take too long. Meanwhile roll back your Photoshop version.
Update: Almost 2 weeks have gone by and I'm still dead in the water. Even rolling back to previous versions (I've tried all available versions) has not brought my GPU back. I don't get the nasty program error with earlier versions, but PS is slow and tools don't work correctly (e.g., no preview with the stamp tool, so stamping is pure guesswork; healing tool leaves a black spot and doesn't reveal the effect until I click somewhere else...).
Device manager says GPU is working fine. I've run diagnostics galore -- no issues. I'm going nuts! Can I get a refund for all the time PS is not working? Sure seems unfair to charge me for a broken product.... My own Photoshop Agony....
Adobe needs to address all their know issues in Photoshop 2021. Adobe knows there are many issues in Photoshop it is not ready for general use. All features in Photoshop have not been fully updated for Photoshop 2021 there are problems. You should use Photoshop 2020 version 21.2.9 till Adobe has address the known issues ind Photoshop 2021. https://helpx.adobe.com/photoshop/kb/known-issues.html
Troubleshooting Photoshop will just confirm Adobe's known issues it will not fix any. Adobe needs to do that.
It seems every 22.x update Adobe changes Photoshop GPU support. Adobe seems to be having problems in their GPU support they are working on it still I would think.