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UPSB MacBookPro : thunderbolt power on failed

My macbook pro 15 (2019) is crashing throwing following logs after catalina upgrade.


Not sure how to fix this, i have tried solutions suggested by their support team but nothing worked. Option pending is backup and erase and reinstall from scratch which i don't want to do. I have heard about apple releasing fault OS releases and causing user's issue.


If someone has been able to found some fix to this probem, do let me know.


panic(cpu 0 caller 0xffffff7f9b72e970): "UPSB(MacBookPro15,1): thunderbolt power on failed 0xffffffff\n"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/IOPCIFamily/IOPCIFamily-370.0.2/IOPCIBridge.cpp:1396



Posted on Oct 15, 2019 3:18 AM

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Question marked as Top-ranking reply

Posted on Nov 3, 2019 3:08 AM

I reached out to physical customer support center and they have ordered new mother board for my laptop. Theu didn't my current one is faulty as their all tests passed but still ordered motherboard as replacement. Hope this will solve the issue.

15 replies

UPSB MacBookPro : thunderbolt power on failed

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