this post was submitted on 10 Sep 2024
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Privacy
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the link light is powered by the switch. it doesnt [necessarily] mean data transfer
No it's not. If you don't believe me, unplug your PC's power cord and watch the light go out.
If the power cord is plugged in but the computer is shutdown, and the light is still on, then that means the network adapter supports WoL or OOB management and must stay on for that reason, but the network switch connected to the adapter is not physically powering any lights.
Also worth noting that Windows is especially bad about actually shutting down when you tell it to shut down because something something fastboot. I've seen similar inconsistently on Linux but I strongly suspect that to be more edgecases with specific hardware and my install.
Fastboot shouldn't affect networking as the hardware itself is powered off.
For cameras on some devices, the camera cannot be used without completing a circuit that turns on a light. I think they're just stating the same is true for the ethernet port light.
Except neither of those things are true.
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.
this 100% factually incorrect.
False