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Possible solution]
Dear members of Mac Rumors,
This is my first post here, and I hope I will not disappoint anyone with my attempt to fix this issue with Mac Pro.
I have purchased Mac Pro late 2013 recently, and I exhibited the similar issue with the switching display GPU driver issue. I tried several fixes posted in this thread here, none of them were able to fix the problem.
I hope you will find this fix working for you, as it turns out it's entirely working for me. Now it is almost one month has been passed without any freezing since I used to have three times a day/freezes.
The solution is so simple to be applied. I have no credit for it, except I was digging for this error for a while and I approached it from a different perspective. I am not expert in fixing mac or programming apps that can fix any hardware issues. So, go to this website:
https://gfx.io/switching.html
download the app called "gfxCardStatus" by Cody Krieger (all the credits goes to this guy). Then install it to your mac pro.
Go to the icon in the Menu bar up. The Icon is the letter "i", and click this one to use the option
- "Dynamic switching" which is an alias for the built-in automatic graphics switching feature in OSX.
Now I think there is so many testing to get for you guys before we announce its a general solution for this issue so we can sleep happy after.
I am looking forward to hearing from you guys, and I wish the best to all of you.
again, this solution is not presented anywhere else, and its working for me 100%. be careful, everytime you will restart your computer you need to click the icon again and hits "dynamic switching".
my intention with this solution is to share a positive deed to others who suffer from such a problem since we all have been abanded by Apple company. I want to ask you a favor which is, if this solution is working for you then please share with us here your experience so others can get to know it's working.
Good luck and I hope you will find this solution working for you.
If you need further information, please let me know here so I can share with you my thorough analysis on this issue and what I think is the main reason causing such hardware issue.