photoshop cc 2018 unable to detect graphics processor on iMac

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Twice now, since I installed MacOS High Sierra 10.13, Photoshop CC 2018 has been in the middle of an operation when it has announced that it can't detect a graphics processor. (I didn't save the dialog, so I can't remember the exact wording). It then turns off acceleration.

I have an iMac (5K) with a AMD Radeon R9 M290X 2 GB graphics processor. My Mac passes Apple Diagnostics with no problems. Lightroom Classic CC detects the graphics processor. But Photoshop says the following (after rebooting and running Apple Diagnostics):


The first time, Photoshop refound the processor after a reboot, but not the second time.

It seems that Photoshop works just fine if I click "Use Graphics Processor" even though PS can't detect a graphics processor, but I am worried about something breaking at some point in the future.

Any thoughts on what might be going on?
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Alan Harper

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Posted 10 months ago

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Warren Heaton

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Well that's peculiar to say the least.

Have you tried checking to see what Illustrator detects?  If it's also having trouble, it could be the AMD graphics card.  If it's not having trouble, it is more likely Photoshop.

Was the macOS installed directly onto this machine or was it cloned from another Mac?  I've had graphics processor issues when using a boot drive from another machine.  Ages ago, the OS install wasn't machine specific, but Apple changed that to reduce the file size of the OS X installer.

As far as Apple Diagnostics go, did you run something other than Disk Utility?  TechTool Pro can check the graphics performance and if the machine is still under AppleCare it may be worth a trip to an Apple Authorized repair facility or an Apple Store to have them run their more advanced, Apple-only diagnostics.

You could also try to reinstall PS cc2017 to see if it's having the same issue or not.



-Warren
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Alan Harper

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Hi Warren

I don't own Illustrator, so that isn't a possibility.

I ran Apple Diagnostics (née Apple Hardware Test), not Disk Utility. It is supposed to test the entire machine. My computer passed with flying colors.

I installed MacOS 10.13 on a clean, freshly formatted, disk and then brought over my user files and applications using Migration Assistant. The boot disk has the old-style formatting.

Yes, I could bring this to the store. And, yes, I could reinstall Photoshop. I'll consider doing either if this persists, but I'd first like to hear if anyone else has these symptoms.

And, FWIW, the situation resolved itself about 2 hours after I posted this comment. Now Photoshop agrees that I do have a graphics card in my Mac. Perhaps it could be temperature or processor-intensive dependent. Both times it happened, I was running a script (action) in PS. But then it takes a few hours to resolve itself, so I am a little flummoxed.

A
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Warren Heaton

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So you held D or Option D for the Apple Diagnostics.

Yeah, your hardware is probably fine.

Is the CC install via Migration Assitant? If so, I’d try uninstalling and reinstalling it.

If not, I’d just keep an eye on it.
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Nemo Niemann

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I just encountered this with a PC after installing the latest nVida drivers for my GTX 1080. Both Illustrator and Lightroom (for which I DON'T use the GPU since it seems like such a pig on my system -- slow and buggy) show the GTX 1080. I seem to be able to use the acceleration in Photoshop, though it can't seem to identify the GPU.
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julia thomas

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I have had more problems with my iMac when processing photos than I can shake a stick at. I was even given a new IMAC by Apple (after loudly complaining that I was sick and tired of not finding a solution from either Adobe OR Apple). I have now turned off the Graphics Process Card and LR and PS are  "screaming" with speed. This has been an issue I have been dealing with for two years! Don't know a ton about the the semantics of it all but can tell you it has been a frustrating ride!