Issue With KVM Switch

[cornemuse]

(I posted this on another forum & posting here to get a different slant from youse guys!)


I started using a new built computer: Gigabyte AM1M-S2H mobo, XP-Pro 32, barebones. It is on a 'six' Airlink KVM switch.
The problem is, when I turn it off, it is still getting (?) power from psu (?) and this keeps power(?) to kvm when new comp is off. I must press kvm's switch to whichever other computer before powering it up, or it 'thinks' there is no kbd or mouse is connected. Its an aggravation!

This happens also with a newer Giga- F2A88X-D3H mobo.

I cant find any settings in bios to stop this, or possibly dont understand particular setting for this.

Any ideas or suggestions?

-corne-

(All the computers are plugged into kvm through 'd-sub' & to several different monitors through dvi/hdmi. This 'system' has worked for years, just not with these new giga mobo's)

 

[thebluebumblebee]

"On/Off Charge™ for USB devices" ?

 

[Bill_Bright]

The problem is, when I turn it off, it is still getting (?) power from psu (?) and this keeps power(?) to kvm when new comp is off.

That's not a problem. That is a requirement of the ATX Form Factor industry standard. All ATX PC power supplies MUST supply +5Vsb standby power to several points across the motherboard, including USB ports, when the computer is shutdown. This voltage is essential to allow such things as the computer's front panel power switch to signal the PSU to power on. It also is used with newer motherboards that support DDR4 RAM to keep data in the RAM in a low power state for faster boots. This voltage is also necessary to allow the mouse or keyboard to wake the computer.

If you don't want this to happen, the surest way is to remove the +5Vsb by unplugging the computer from the wall, or flipping the master power switch on the back of your PSU (if it has one) to "0" or off. If the computer is plugged in to the wall, and the master power switch is set to "1" or on, it IS in standby mode - even if you "Shutdown" the computer via Windows and/or the case's front panel power button.

Your only other option is to look in your motherboard owner's manual to see if there is an option in the BIOS to disable power to the USB ports when the computer is in standby mode. But note if you disable that, you will always have to boot by pressing the computer's power button. Wiggling the mouse, pressing a mouse button or keyboard key will be ineffective.

 

[cornemuse]

Your only other option is to look in your motherboard owner's manual to see if there is an option in the BIOS to disable power to the USB ports when the computer is in standby mode. But note if you disable that, you will always have to boot by pressing the computer's power button. Wiggling the mouse, pressing a mouse button or keyboard key will be ineffective.

I have to do that anyway, , , It does not wake on kbd/mouse, on anything but power button, I dont have a problem with that anyway. The computers are some distance from my desk, I have extension 'power buttons' under the monitor used by that particular computer.

I have power plug on a switched extension cord for this comp,

I will go through the manual again, , , ,

-c-

 

[thebluebumblebee]

Are you, BTW, using PS2 to USB adaptors? Some of them won't work correctly. I've had great success with: http://www.newegg.com/Product/Product.aspx?Item=N82E16812120006

 

[cornemuse]

I have tried: ps2 mouse & kbd, usb mouse & kbd, & various combinations, The keyboard of choice for me is a 15 +- yr old BTC with a huge plug, adaptor to ps2, even tried then adaptor to usb.
No keyboard, mouse combination changes anything with gigabyte mobos. Their web site has sooo many hurdles to jump, I gave up trying to get any info from them.

-c-

 

[thebluebumblebee]

"On/Off Charge™ for USB devices" ?

Have you looked in the BIOS if you can turn that off?
Secondly, if the fix is as easy as switching the KVM to another system, then that's a minor life aggravation.

 

[cornemuse]

Figured out solution: > bios > power management > all the way to bottom > ErP > enable.

Most things show explanation, not this. 'Enable' to disable. Seems counterintutive to me, , , but it works.
Basically, Mobo has option of being able to charge usb 'things' when computer is off, "Enabling" turns off supplying usb power when comp is off.

-c-

 

[Bill_Bright]

'Enable' to disable. Seems counterintutive to me...

Yeah, it is kind of a backwards way of labeling but note USB charging is really just a consequence of the feature. It does not help understanding knowing that ErP stands for Enterprise Resource Planning! ???

"Enabling" the ErP feature "disables" the ability to wake from a "shutdown" state with anything but the power switch. With ErP disabled, you can use the "Wake on Mouse" or "Wake on Keyboard" features (which of course, typically use USB these days), to wake the computer, or even remotely with the "Wake on LAN" feature enabled. It has no effect on waking from sleep.

It's an environmental thing because otherwise, the system is in a standby state that consumes more (but not a lot with modern systems) energy.

Anyway - good find! Thanks for posting your solution!

 

[cornemuse]

Another issue I see is, using older hdd's in usb cases. Leave one plugged in with computer off, (ones that dont spin down after some period of time), they're allus 'on & spinnin''. Something to consider, , , ,

-c-

 

[DeathtoGnomes]

Yeah, it is kind of a backwards way of labeling but note USB charging is really just a consequence of the feature. It does not help understanding knowing that ErP stands for Enterprise Resource Planning! ???

"Enabling" the ErP feature "disables" the ability to wake from a "shutdown" state with anything but the power switch. With ErP disabled, you can use the "Wake on Mouse" or "Wake on Keyboard" features (which of course, typically use USB these days), to wake the computer, or even remotely with the "Wake on LAN" feature enabled. It has no effect on waking from sleep.

It's an environmental thing because otherwise, the system is in a standby state that consumes more (but not a lot with modern systems) energy.

Anyway - good find! Thanks for posting your solution!

maybe you can explain Hibernation so as not to confuse everyone with "shutdown" state.

 

[Bill_Bright]

The OP has resolved his issue. Hibernation is totally off topic, and is designed for notebooks, not PCs (which use hybrid sleep). If you want to learn about hibernation, I might suggest Bing or Google.