I have recently spent a lot of time reading the USB 2.0 specification and figuring out a race condition I've been experiencing that turned out to actually be a deficiency of the spec itself.
Just for fun, I asked ChatGPT about it. This is its answer:
> According to the USB 2.0 specification, a remote wakeup event can be initiated by a USB device in a suspended state to request the host to resume communication with the device. The device sends a remote wakeup signal to its hub, which then forwards the signal to the host.
> However, if the upstream port of the hub is in the process of being suspended, the remote wakeup signal from the downstream device may not be received by the host. This is because the hub's upstream port is no longer able to forward the signal to the host during the suspension process.
> As a result, the remote wakeup event may fail, and the downstream device may remain in a suspended state indefinitely. To avoid this race condition, the USB 2.0 specification recommends that downstream devices wait for a certain period before sending a remote wakeup signal to their hubs to ensure that the hub's upstream port is not being suspended.
It sounds as if it made perfect sense, except to know that it actually completely doesn't you have to spend hours reading the spec first.
We're going to see a huge spike of confidently wrong "experts" if they learn by asking ChatGPT to explain things to them.
Just for fun, I asked ChatGPT about it. This is its answer:
> According to the USB 2.0 specification, a remote wakeup event can be initiated by a USB device in a suspended state to request the host to resume communication with the device. The device sends a remote wakeup signal to its hub, which then forwards the signal to the host.
> However, if the upstream port of the hub is in the process of being suspended, the remote wakeup signal from the downstream device may not be received by the host. This is because the hub's upstream port is no longer able to forward the signal to the host during the suspension process.
> As a result, the remote wakeup event may fail, and the downstream device may remain in a suspended state indefinitely. To avoid this race condition, the USB 2.0 specification recommends that downstream devices wait for a certain period before sending a remote wakeup signal to their hubs to ensure that the hub's upstream port is not being suspended.
It sounds as if it made perfect sense, except to know that it actually completely doesn't you have to spend hours reading the spec first.
We're going to see a huge spike of confidently wrong "experts" if they learn by asking ChatGPT to explain things to them.