MBA 2011 keyboard/trackpad freeze

Mar 13, 2015
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I have a MacBook Air 13", 2011, with Mavericks.

The problem in a nutshell: the keyboard and the trackpad freezes. Putting it to sleep sometimes helps.

The problem detailed:
  • trackpad behaves erratically for a second, then dies. System Preferences reports no trackpad.
  • the keyboard also dies (except the power button)
  • bluetooth dies shortly after. Bluetooth icon crossed out.
  • right side USB stops working

I can still use the left USB port to connect an Apple keyboard and a mouse.

I have tried:
  • Clean install of Yosemite (this is of course more radical than kext cache cleaning, startup item cleaning and etc. on an existing install)
  • SMC / PRAM reset
  • Safe mode boot
  • Disassembly to the point of removing the touchpad ribbon cable, bluetooth/wifi module and the battery
  • Multiple power supplies / outlets / staying on battery power

It might be a hardware problem, but I need help to narrow it down.

Some common log entries related to this:

  • SMC::smcReadKeyAction ERROR: smcReadData8 failed for key B0OS
  • AppleUSBHubPort::FatalError - Port 1 of Hub at 0xfa100000 reported error 0xe00002c0 while doing setting port power
  • SMC::smcInitHelper ERROR: MMIO regMap == NULL - fall back to old SMC mode
  • AppleUSBMultitouchDriver::message - kIOUSBMessagePortHasBeenReset.
  • AppleUSBMultitouchDriver::validateChecksum - 22-byte packet checksum is incorrect

A more detailed history, I couldn't find any help there.

I'm hoping to find someone who encountered a similar problem.



Well-known member
Staff member
Jan 23, 2008
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Keller, Texas
Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Welcome to the Mac-Forums.

That's quite a long thread you started over in Mac Rumors, thanks for posting the link. After looking at the errors and your attempts at repair, it appears you're fighting a losing war. I'm betting that you've got a defective (intermittent) logic board problem that likely is only going to get repaired by replacing it. Good luck with it.

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