this post was submitted on 10 Sep 2024
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I don't know enough about ethernet switches to know if this is common. Though, reading their comment again, I don't really think I'm right about their statement. It's definitely a light that is frequently designed to be on when packets are still being accepted for waking the computer.
I don't have a background in CE, but I've seen people claim this is sometimes a design used in the past. I think it makes sense that a circuit that is controlled by the computer can be hard wired to turn on both a light and a ethernet port. Though, I don't know how common this design is in reality.
edit: After searching some, it looks like some port lights can be controlled by a driver. I still think it probably depends on the hardware design though, and this won't be consistent between ports.
sure it depends on the design, but no standards-compliant non-PoE Ethernet design is going to light up an LED, it barely uses 1 volt.
I think driver examples from the Linux kernel are very convincing evidence that the lights can be controlled entirely by software, but I'm interested to see any possible specific port designs where that isn't true.
I was not refuting that, yes drivers can control the LED since forever. The original comment was "the link light is powered by the switch", which I'm saying is not possible. An ethernet switch (assuming it's not PoE) cannot directly power an LED on a network adapter in your PC let alone the rest of it, that's all I'm saying.