Which Power Control Option Performs A Warm Boot?

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INTERESTING: USB power during restart

Question
Hi,

I ran into interesting trouble regarding USB port powering during warm kick (restart) and would be glad if someone could provide more data on background of this event. One of our customers has USB powered VPN device which is used to admission corporate network past mobile users. The trouble I am about to described was noticed when they started using Lenovo ThinkPad T420 notebooks with Windows 7 (previously they used various Dell Breadth and ATH notebooks with Windows XP). The user has to authenticate to VPN device in order to activate the VPN connexion. The hallmark is performed through the spider web browser. Then the user logs in to Windows, opens web browser, authenticates VPN device and is connected to corporate network. If whatever restarts are required to apply Reckoner Grouping policy, the calculator has to be restarted. It is crucial that during the restart the VPN device remains powered - if it looses power, it has to be authenticated once more... On Dell computers at that place was no problem, USB power was constant on and after the reboot, the computer was still connected to corporate network. On Lenovo, the USB power is asunder for a second during the reboot and VPN device becomes inactive. Puzzling are the results of my tests:

DELL Latitude E6500 with latest BIOS (A25), USBPowerShare enabled, VPN device continued to powered USB port:

- USB ability during warn boot (restart) from Windows XP, Windows 7 and Linux, BIOS POST: nowadays

- USB power after shutdown: not present (the device has to be disconnected/reconnected to receive power in this state)

Lenovo ThinkPad T410 with latest BIOS, USB Always-On enabled, VPN device connected to powered USB port:

- USB power during warm kick (restart) from Linux, BIOS Post: nowadays

- USB ability during warn boot (restart) from Windows XP, Windows seven: lost for a second

- USB power later shutdown: lost for a second

Why is the power on USB lost for a second when rebooting Windows on the ThinkPad and remains when rebooting from BIOS Mail service or Linux? Evidently Windows warm reboot sequence is different.

Thanks for any information regarding this topics.

Best regards,

Blaz Malnersic
- Edited by Fri, December 2, 2011 10:07 AM

Answers

Hi,

From your clarification, you lot want to go along the USB device powering during a reboot. Delight understand, this behavior is controlled past BIOS, I suggest that you could contact the Lenovo support the bank check whether this laptop support this behavior and how to set this in BIOS:

http://support.lenovo.com/en_US/

Discover: Since the website is not hosted past Microsoft, the link may change without discover. Microsoft does not guarantee the accuracy of this.

Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked mail service does not actually reply your question. This tin exist beneficial to other community members reading the thread. "
- Marked as answer by Arthur Xie Tuesday, December 20, 2011 8:10 AM
How a motherboard/BIOS handles the USB ports can vary not only from manufacturer to manufacturer, just even from model to model. On my old Asus MB, as soon equally I powered it on, my keyboard would light up (USB keyboard) and I could get into BIOS every bit before long as the Postal service was through. But on my newer Asus MB, the USB ports aren't powered until sometime during the POST, making the ability to get into BIOS a footling more than hit and miss. All of this happens before the operating arrangement even comes into play.

On a warm boot, equally shortly as you see the "logging out", "shutting downwards" screens, your Os is no longer in play. Now everything that happens with your ports is controlled by the computer itself until you run across the "loading you personal settings" screen, or right before that. If the ports lose power between those shut downwardly and startup screens, that's on the hardware manufacturer, not on Windows. Your Lenovo loses power, your Dell kept the power, my Gateway laptop keeps the ports powered on a reboot (or appears to from the lights on the controller I connected to it), but my Asus MB doesn't. That'due south why I said that Windows has nix to do with it, that information technology's all in the manner of how the hardware handles it.

Practiced luck with whatever works for you. If the the ports lose ability like that, maybe an externally ability VPN would work? Or is your VPN device but an hallmark key? I haven't used VPN in years, but don't call back having annihilation connected to my figurer to utilise information technology other than a network cable to my router (the laptops we had didn't have wireless ) ).

SC Tom
- Marked equally answer by Arthur Xie Tuesday, Dec 20, 2011 8:ten AM