WinUSB: Win 8.0 vs. Win 8.1

Hi,We have a device that works fine under Windows 7 and Windows 8.0 using WinUSB driver. We ran into a problem with Windows 8.1. Win 8.1 does recognize the device. Did Microsoft change something about WinUSB in Win 8.1?
Thanks,Alan.

Failure to enumerate/recognize would be an issue with the usb core stack, not winusb. Capture an etw usb trace log and see what is reported

d

Bent from my phone


From: malanalanmailto:xxxxx
Sent: ?11/?10/?2014 6:46 PM
To: Windows System Software Devs Interest Listmailto:xxxxx
Subject: [ntdev] WinUSB: Win 8.0 vs. Win 8.1

Hi,
We have a device that works fine under Windows 7 and Windows 8.0 using WinUSB driver. We ran into a problem with Windows 8.1. Win 8.1 does recognize the device. Did Microsoft change something about WinUSB in Win 8.1?

Thanks,
Alan.


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Thanks for the tip! That’s right. Our device would not work with some Dell computers unless it was plugged in to a powered USB hub. 
BTW. I noticed the same problem (and same resolution) with some Dell computers and my Galaxy Nexus phone.

On Monday, November 10, 2014 6:58 PM, Doron Holan wrote:

Failure to enumerate/recognize would be an issue with the usb core stack, not winusb. Capture an etw usb trace log and see what is reported

d

Bent from my phoneFrom:malanalan
Sent:‎11/‎10/‎2014 6:46 PM
To:Windows System Software Devs Interest List
Subject:[ntdev] WinUSB: Win 8.0 vs. Win 8.1

Hi,We have a device that works fine under Windows 7 and Windows 8.0 using WinUSB driver. We ran into a problem with Windows 8.1. Win 8.1 does recognize the device. Did Microsoft change something about WinUSB in Win 8.1?
Thanks,Alan.

NTDEV is sponsored by OSR

Visit the list at: http://www.osronline.com/showlists.cfm?list=ntdev

OSR is HIRING!! See http://www.osr.com/careers

For our schedule of WDF, WDM, debugging and other seminars visit:
http://www.osr.com/seminars

To unsubscribe, visit the List Server section of OSR Online at http://www.osronline.com/page.cfm?name=ListServer

NTDEV is sponsored by OSR

Visit the list at: http://www.osronline.com/showlists.cfm?list=ntdev

OSR is HIRING!! See http://www.osr.com/careers

For our schedule of WDF, WDM, debugging and other seminars visit:
http://www.osr.com/seminars

To unsubscribe, visit the List Server section of OSR Online at http://www.osronline.com/page.cfm?name=ListServer