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#1
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Network card query
Why is it some devices seem to keep network card powered up even when unit is turned off? My "smart" Blue-ray player shows up doing an IP scan even though it's not been turned on in weeks or more. My little netbook's network card light stays on even when pc is turned off but it doesn't show in the ip scan. Same thing with two (possibly more) desktops I have. have to unplug them to make light go out. Some units clearly go off, e.g. an older XP era laptop seems to turn off everything and as well a more modern dual-core laptop also. Or at least all the lights go out. Is there any setting I should be looking at? When turned off I want the damn thing to be completely off and not just look like it is. |
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#2
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Network card query
On 4-2-2019 17:31, pjp wrote:
Why is it some devices seem to keep network card powered up even when unit is turned off? My "smart" Blue-ray player shows up doing an IP scan even though it's not been turned on in weeks or more. My little netbook's network card light stays on even when pc is turned off but it doesn't show in the ip scan. Same thing with two (possibly more) desktops I have. have to unplug them to make light go out. Some units clearly go off, e.g. an older XP era laptop seems to turn off everything and as well a more modern dual-core laptop also. Or at least all the lights go out. Is there any setting I should be looking at? When turned off I want the damn thing to be completely off and not just look like it is. Not using w10 maybe? |
#3
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Network card query
On Mon, 4 Feb 2019 12:31:06 -0400, pjp wrote:
Why is it some devices seem to keep network card powered up even when unit is turned off? My "smart" Blue-ray player shows up doing an IP scan even though it's not been turned on in weeks or more. My little netbook's network card light stays on even when pc is turned off but it doesn't show in the ip scan. Same thing with two (possibly more) desktops I have. have to unplug them to make light go out. Some units clearly go off, e.g. an older XP era laptop seems to turn off everything and as well a more modern dual-core laptop also. Or at least all the lights go out. Is there any setting I should be looking at? When turned off I want the damn thing to be completely off and not just look like it is. You could look in the BIOS to see if wake on lan is turned on. -- Regards - Rodney Pont The from address exists but is mostly dumped, please send any emails to the address below e-mail rpont (at) gmail (dot) com |
#4
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Network card query
pjp wrote:
Why is it some devices seem to keep network card powered up even when unit is turned off? My "smart" Blue-ray player shows up doing an IP scan even though it's not been turned on in weeks or more. My little netbook's network card light stays on even when pc is turned off but it doesn't show in the ip scan. Same thing with two (possibly more) desktops I have. have to unplug them to make light go out. Some units clearly go off, e.g. an older XP era laptop seems to turn off everything and as well a more modern dual-core laptop also. Or at least all the lights go out. Is there any setting I should be looking at? When turned off I want the damn thing to be completely off and not just look like it is. WOL and heartbeat. A NIC on a motherboard could have access to standby power (+5VSB). Using Device Manager, check the properties of the NIC and see if the "Allow this device to turn on computer" or similar is selected. The combination with such a PME (power management event) bit, plus a selection of a WOL (Wake On LAN) rule (what flavor of WOL to honor), a device can keep a link "warm". With the "power off", the device may still keep the link alive for WOL purposes. Heartbeat is a mechanism for the PHY on either end, to know a link is present. The +5VSB available from an always-powered ATX supply, can supply +3.3V and +1.8V for the NIC chip, to keep it powered. The Device Manager tick box, is what enables or removes those two rails when the computer sleeps. It's possible for any network device now, to have a MAC with a processor, and do any amount of protocol on its own. For example, there are Wifi MACs which are allowed to keep a Wifi link active and operational. Again, for the purposes of supporting WOL over Wifi. But it would not surprise me if that was extended to returning a ping. They really should not do that, since ping is used as a means to sus whether a host CPU is frozen or operational. A powered off node should not "ping" as that implies (wrongly) that the host CPU is sane. If you buy a Business PC with Intel Management Engine, the Intel NIC provided is a "dual head" unit, that filters traffic on its own. When the Business PC is crashed (CPU not sane), the dual head NIC still forwards IME traffic to the management engine, so the PC can be "tilted upright" by IT staff. You can reset a PC via management engine packets to the Intel NIC supporting such activity. You can also wake such a PC that way. Even if the Business PC is sleeping, it can be awakened remotely. It doesn't have to be WOL, because one head of the NIC is always supposed to be online for the purposes of the management engine interface. If your PC has a RealTek NIC, chances are it does not have that "Intel supporting feature". Certain Microsoft Surface products support a newer power paradigm called S0ix. Perhaps this was called Digital Home at one time (DH), indicating an "always on" product which blurs the lines between sleep and running states (but DH would not have had the advantage of modified ACPI to go with it). The product may nominally not be drawing power for the CPU, but any time a hardware interrupt comes in (attempt to ping NIC, packet now in NIC buffer), the CPU can wake up for a fraction of a second and process what has happened. This is a practical concept for battery powered devices (with silent power converters), but would drive you nuts on a desktop (as the ATX supply fan would run). https://www.thurrott.com/mobile/micr...sleep-problems Whereas a regular PC would have S0, S1, S3, S4, the S0ix computing device kind of "mashes together" S0 thru S3 into a state of its own. It means the machine can sleep if it isn't doing anything. And with out the normal notion of sleep. (If the computing device is small and portable, it has NAND flash file storage, battery power, silent power converters, it can be "very busy" or "sleepy" without anyone being aware what it's doing. Creepy almost... The only thing that gives it away is when it gets warm, or a fan comes on because too much CPU is being used for passive cooling to work.) Devices like that should really have a LED indicating power state (LED blinks when "busy"). Paul |
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