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#1
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Powering up via Keyboard (only works after shutdown)
I've just assembled a 'media box' (Asus P4SP-MX, Antec Aria Case/PSU,
2GHz Celeron, Sapphire Radeon 9200SE, Win XP SP2) and run smack into the brick wall that is my understanding of ACPI. I've got the BIOS set to power up in response to a keyboard event; which works fine if the computer was powered down using the 'shutdown' option in windows but completely ignores me if I've just switched the power on at the mains socket. I *think* this must be because when windows shuts down the PSU continues to draw a trickle charge (the 5VSB line?) which is then enough to monitor the keyboard. For some reason though the PSU can't respond to being switched on at the mains by going 'Oh good, power, now I can turn on enough to wait for that nice man to fully start me up with his keyboard'. It is physically difficult to get to the power button on the machine itself since it lives in a wardrobe with extension leads running to monitor, speakers, network, KVM switch, etc. It runs cool enough (32C under load) but I'd prefer to switch it off at the mains when I'm not using it. My questions, therefore, a 1. Am I right that a windows shutdown still leaves the box drawing some power (which my switching off at the wall interupts)? 2. What options do I have for powering it up after turning it on at the wall (i.e. will only the power switch on the box itself work)? 3. Does leaving the box switched on at the wall (after a windows shutdown) represent more of a fire risk than say a DVD, Video or TV? Regards, Matt |
#2
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Tomcat wrote:
I've just assembled a 'media box' (Asus P4SP-MX, Antec Aria Case/PSU, 2GHz Celeron, Sapphire Radeon 9200SE, Win XP SP2) and run smack into the brick wall that is my understanding of ACPI. I've got the BIOS set to power up in response to a keyboard event; which works fine if the computer was powered down using the 'shutdown' option in windows but completely ignores me if I've just switched the power on at the mains socket. I *think* this must be because when windows shuts down the PSU continues to draw a trickle charge (the 5VSB line?) which is then enough to monitor the keyboard. For some reason though the PSU can't respond to being switched on at the mains by going 'Oh good, power, now I can turn on enough to wait for that nice man to fully start me up with his keyboard'. It is physically difficult to get to the power button on the machine itself since it lives in a wardrobe with extension leads running to monitor, speakers, network, KVM switch, etc. It runs cool enough (32C under load) but I'd prefer to switch it off at the mains when I'm not using it. My questions, therefore, a 1. Am I right that a windows shutdown still leaves the box drawing some power (which my switching off at the wall interupts)? 2. What options do I have for powering it up after turning it on at the wall (i.e. will only the power switch on the box itself work)? 3. Does leaving the box switched on at the wall (after a windows shutdown) represent more of a fire risk than say a DVD, Video or TV? Regards, Matt 1. Yes. But the Southbridge has two sections to it. One is powered by the "awake" voltages, the other half via +5VSB or the CMOS battery. I would hope the ACPI related circuits are powered by the CMOS battery, in which case the motherboard could be awakened after a power failure. Maybe the state of the keyboard has something to do with it ? Does a keyboard need to be configured, or will it do the right thing when its power comes up ? Have you tried waking the system after a power failure, using any other method supported by your motherboard ? 2. See "AC Power Loss Restart". If you enable it, then every time power is applied to the box, it will boot. The only question is, whether it can be shut down properly again. I'm not sure "last state" is always going to do the right thing. In any case, play with that setting and maybe you'll get some functionality you can use. 3. The +5VSB circuit inside the PSU is running, and the fan is not. Something inside the PSU does get warm by doing this. As I've never seen a circuit diagram for how they do +5VSB, it is hard to guess at how it might fail. Now that I think about it, it is possible the main caps on the PSU are charged by line voltage, while +5VSB is running. That is why +5VSB can run for 30 seconds after the switch on the back of the PSU is switched off. The main caps are the only thing that could store that much power. So, I would say there is still some nasty stuff in the loop at that point (+5VSB being used). In a sense, if +5VSB is still running, a portion of the main circuit (rectifiers and caps) is still running too - it is just the main switcher that is stopped. I guess that makes it a little more reliable than when the whole thing is running, but not by much. The main transistors still have potential across them. But, no secondary side faults can get you - so no failed components on the other side of the transformer can affect the PSU when it is "sleeping". HTH, Paul |
#3
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It is the same with Asus A7N8X-E.
"Paul" a écrit dans le message de news: ... Tomcat wrote: I've just assembled a 'media box' (Asus P4SP-MX, Antec Aria Case/PSU, 2GHz Celeron, Sapphire Radeon 9200SE, Win XP SP2) and run smack into the brick wall that is my understanding of ACPI. I've got the BIOS set to power up in response to a keyboard event; which works fine if the computer was powered down using the 'shutdown' option in windows but completely ignores me if I've just switched the power on at the mains socket. |
#4
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FG wrote:
It is the same with Asus A7N8X-E. It has an AC Power Loss Restart setting also. I don't know if it has the same wake up options, as they tend to differ from product to product. Paul |
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