USB2.0 speed drops on waking from sleep in W7

November 6, 2010 at 01:40:24
Specs: Windows 7, Core i7/6GB
After bootup, my high-speed USB devices are all connected to "Enhanced" Host Controllers and appear to work correctly at USB 2.0 data rates. When my computer awakes from "Sleep" mode, I get one or more of the messages that "This USB device can perform faster if you connect it to a HI speed USB 2.0 port." When look at the status of my USB Host Controllers, I find that my high-speed USB devices are now listed under "Universal" Host Controllers (rather than "Enhanced"), and, I assume, they are operating at USB 1.0 data rates. Can anyone explain why my USB devices change from "Enhanced" (USB 2.0) to "Universal"(USB 1.0) host controllers after Sleep and, more importantly, how to keep this from happening? When I reboot, everything changes back to normal, and the high-speed USB devices are again listed under the "Enhanced" host controller. Any help would be appreciated.

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#1
November 6, 2010 at 03:27:37
Obvious soluttion don't put the computer to 'sleep'. Just shut down and startt from off.

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#2
November 6, 2010 at 05:10:32
What devices do you have connected to those ports?

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#3
November 8, 2010 at 21:48:56
OtheHill, I have a USB keyboard and mouse which only require a low-speed connection; however, my external hard drive and HD web cam both need a 2.0 connection to function properly. After a fresh reboot they are all correctly connected, but after a subsequent "sleep" mode, all USB devices are assigned to "universal host controllers"; and I have no devices listed under my "enhanced host controllers" Thanks.

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#4
November 8, 2010 at 23:00:10
After a reboot do you see a mix of both types of ports listed in Device Manager or are all Enhanced?

Are you using ports that are directly fixed to the motherboard, on brackets or front case ports? Are you using a USB hub of any kind?


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