USB issues


These issues are not necessarily related to a specific OS but are general issues that can be encountered.

Delay recognising USB device

During system startup or when a device is hot plugged there will be a delay of between 5 and 10 seconds before the device is discovered and ready to use as explained here.

The UPDD Console shows the state of each UPDD device. The Console is periodically refreshed when on display.

Therefore, when a USB device is plugged in it can take a short period of time to be discovered and start working and for the device status to be updated in the Console dialog.

USB stall issue

This can occur during the initalisation of the device or when attempting to read data from the device as described here.

USB device not discovered

Sometimes the device can be listed in a MacOS system but not seen by the driver as described here.

USB Device read errors

For HID compliant USB devices the driver attempts to read information from the HID Descriptor. This can sometime fail.

The debug log will show that the driver has accessed and interacted with the device but the HID descriptor read failed as seen in the debug log:

2019/06/20-18:12:26: TRC: Configuration has 1 interfaces
2019/06/20-18:12:26: ERR: USB error: (get serial number) Other error
2019/06/20-18:12:26: ERR: USB error: (get product) Other error
2019/06/20-18:12:26: ERR: USB error: (get manufacturer) Other error
2019/06/20-18:12:26: TRC: Found interface 0 class 3
2019/06/20-18:12:26: TRC: Interface 0 is supported
2019/06/20-18:12:26: ERR: USB error: (claiming interface) No such device (it may have been disconnected)

 or

2019/08/29-08:49:02: ERR: About to throw exception at line #969 in file ../../06_00/updd/upddmessagedispatcher.cpp   Device not found
2019/08/29-08:49:02: ERR: About to throw exception at line #149 in file ../../06_00/updd/upddmessagedispatcher.h   Device not found
.
.
2019/08/29-08:50:04: DBG: USB warning: (get config active descriptor; failed will try index zero) No such device (it may have been  disconnected)
2019/08/29-08:50:04: ERR: USB error: (get config descriptor) No such device (it may have been disconnected)

We also attempt to read the HID Report Descriptor and we use some of the information contained within to automatically configure the device.

Further, we read the HIDRD (even in some cases when it's not actually used) as this is one of the methods we use to determine whether a device is connected.

We have had many reports of USB connection issues purely related to a 'bad' USB cable and replacement cables have worked.

At other times, these failures have been seen when using USB extenders or incompatible USB hubs, such as reported with a Sabrent USB3 hub. Directly connecting the USB device with a standard short USB cable normally resolves the issue and / or when connected directly via two USB-A/C adapters. Also when going through Apple's own USB-C Digital AV Multiport Adapter (which is reported as USB2 according to "ioreg -p IOUSB").  

If a USB extender is in use and failing its possible that:

  1. Not enough power to the extender.
  2. Extender not fully USB compliant.
  3. Extender is trying to handle HID and making incorrect assumptions
  4. Extender is not compatible with the Operating System USB stack.

One possible solution is to supply a driver that does not access the USB Descriptor and carries the device's HID Report Descriptor in the device's UPDD settings.

To allow for this we need to supply a driver with settings disable_interface_prolog and hid.skip_hidrd_check enabled and be supplied the HIDRD from a UPDD driver diagnostics when the device is working (e.g. directly connected).

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