After Windows 26220.7653 Update, Midi ports disappering, Some USB devices not reachable

Question

The new midi services framework seems to be causing some problems. Certain apps (e.g. Ableton) can only read the first ten midi devices. Devices that need a Korg driver must be in the top ten. This doesn't seem stable and I can't seem to get it to load consistently. If I get a device to work then immediately I stop or start and app or bluetooth, the settings get lost. These drivers are used by many devices including Bluetooth midi devicesfrom Korg and CME, both major device suppliers. Is there some way I can back out the updates to midi enumeration and driver allocation to an earlier version of the windows midi implementation? I'm trying to avoid a full rebuild.

Also since the updatem one of my USB devices (Hotone Ampero II) cannot be connected from its app. The audio connects fine via usb/asio. The USB midi ports are not detected. Might this also be related to the Midi connection and enumeration problems?

Answer 1

It appears that the issues you are experiencing with MIDI ports disappearing and USB devices not being reachable after the Windows update may be related to changes in the MIDI services framework. Unfortunately, the context does not provide specific instructions on how to revert to an earlier version of the MIDI implementation or to back out the updates made to MIDI enumeration and driver allocation.

For the USB device issue, particularly with the Hotone Ampero II, it is possible that the problems with MIDI connection and enumeration are interconnected. The context does not detail a direct solution for this specific scenario, but it suggests that issues with USB audio or MIDI devices can sometimes be resolved by uninstalling the device or connecting it to a different USB port.

If the problem persists, you may want to check for any updates or patches from Microsoft that address these issues or consult the device manufacturers for further support regarding driver compatibility with the latest Windows update.

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References:

• MIDI Port Driver
• USB-connected audio or video devices malfunction when connected to specific Intel-based devices

Answer 2

Here are the known issues and workarounds for the new Windows MIDI Services stack that started rolling out at the end of January.

https://devblogs.microsoft.com/windows-music-dev/windows-midi-services-rollout-known-issues-and-workarounds/

Pete
Microsoft

Answer 3

I've left the Insider programme and the PC did two repair updates before finally doing an update back to 25H2. This seems to have removed the problems. I think that once the new windows midi services and GUI is fully released these problems will have been sorted. I think the AI generated answer summarise the problem nicely but the solution is some way off.