As you have found, multiple GPUs is known to cause issues with Photoshop.
Section 7 here gives advice on how to ensure Photoshop uses one GPU by assigning rather than disabling. It may help.
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Photoshop is known to have issues with dual graphics card, take a look here and scroll down to this bit and see if that helps
a. Right-click anywhere on the desktop and choose the NVIDIA control panel.
b. Click Manage 3D settings.
c. Click Program Settings and add Photoshop.exe and sniffer.exe. Change the preferred graphics processor to High-performance NVIDIA processor.
Sorry Dave we posted at the same time with the same link
Mind you my post keep going into moderation
Thanks to you and Dave for the lead.
For whatever reason I do not get the nVidia control panel - get one for Intel only. Is this a downloadable app? Is it the same as GForce Expressions, which I deleted based upon a comment in the Adobe search.
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You need to have the Nvidia driver installed, you can download the latest driver from here
If the driver is already installed just right click on the desktop and select this option
Once there go to Manage 3D settings and click on the add button and navigate to the below location and add Photoshop.exe, depending on your version of PS
and repeat for sniffer.exe
To you and Dave - wrote the following in a message but wanted it to be public.
"For some reason the forum now has me locked out. I'll try to sign of and back on, but I want to at least get back and thank you for the help. I reinstalled Gforce Expressions, d/l latest driver and the panel showed up. After that I followed your and Dave's advice and all is well. Thank you, thank you and thank you."
You're welcome - and well done Ged for the detailed screenshots
Got the same problem:
Since the new Lightroom Classic 2017 my old Laptop couldn't run it anymore. No problem so far as it was pretty old.
However, now I bought a brand new HP Envy with a Nvidia Geforce MX150 graphics card.
And again: Lightroom Develop module is not working! If I disable the Nvidia card everything works fine. Latest drivers already installed.
Since the new Lightroom Classic 2017 everything is screwed up and that really drives me mad!
I am now considering to cancel my subscription plan and move to another software.