Apple fixes USB 2.0 connection bug in Catalina, Big Sur still affected

Posted:
in General Discussion edited July 2020
The new macOS Catalina 10.15.6 update has successfully addressed an intermittent bug that meant 2020 MacBook Air and MacBook Pro models would randomly disconnect USB 2.0 accessories.

Apple's 2020 MacBook Air
Apple's 2020 MacBook Air


With the new release of macOS Catalina 10.15.6, Apple has fixed an issue that meant USB 2.0 devices such as keyboards or mice would disconnect from the latest MacBook Air, or 13-inch MacBook Pro, seemingly at random. Previously, the best workaround was to restart the machines, but that didn't reliably fix the issue.

The Catalina update "[resolves] an issue where certain USB mouse and trackpads may lose connection," says Apple, in its release notes. As is typical for a brief release note, there are no further details about the fix.

However, the fix has not as yet been applied to the latest beta versions of the forthcoming macOS Big Sur. While the first developer betas of that were released after news broke of the problem, testers have reported having the same problem.

Users on Big Sur or the previous version of Catalina say that the problem can be temporarily resolved by rebooting, disconnecting and reconnecting a USB hub, or other such workarounds. Certain docks such as the CalDigit Thunderbolt 3 dock circumvent the issue by always taking USB 2.0 devices and presenting them to the host Mac as if they are USB 3.0.

Comments

  • Reply 1 of 5
    sflocalsflocal Posts: 5,728member
    Did Big Sur receive an update, or do people think it will magically work when an update for Catalina comes out?

    i don’t get why Big Sur is even brought up.  There’s a reason why it’s still beta.
  • Reply 2 of 5
    Mike WuertheleMike Wuerthele Posts: 6,259administrator
    sflocal said:
    Did Big Sur receive an update, or do people think it will magically work when an update for Catalina comes out?

    i don’t get why Big Sur is even brought up.  There’s a reason why it’s still beta.
    In the past, when we've had overlaps like now and fixes rolled out, that is the #1 question -- does the beta whatever have the fix?
    ivanhfastasleep
  • Reply 3 of 5
    jkichlinejkichline Posts: 1,352member
    I’ve had two Macs now on Catalina that have this serious issue. Specifically, if I connect a hyperdrive adapter or my USBC to USB and then an SD card, the entire internal USB hub will disable including the built in keyboard and mouse, requiring a restart. This happens about every time I try to read an SD card. I sure hope this fixes the issue!
  • Reply 4 of 5
    widmarkwidmark Posts: 31member
    Good to hear.

    Some BenQ monitors using DisplayPort intermittently flash blue screens when a Mac goes to sleep. I have this problem using a CalDigit docking station. Hoping Apple may be cleaning up other interface bugs, although it may be an issue on BenQs side.
  • Reply 5 of 5
    Im getting a few USB issues with Mojave MacBook air 2010 were the device disconnect warning shows while connected and in use.
    Mountain lion seem good tho.

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