Windows 10: Usbser.sys does not issue selective suspend as documented

Hello everybody,
coming from the What is new in usbser page. The topics mentioned there insider seem to have been changed meanwhile, so I post it here.


The documentation states we have two choices for selective suspend SS, but 0x00000001 behaves like 0x00000000:

To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:

• 
  "0x00000001"
  
  Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
  
  
• 
  "0x00000000"
  
  Enters selective suspend only when there are no open handles to the device.
  

I checked with an USB analyzer, there is no traffic, but the driver does not issue SS. If the app calls CloseHandle, then the device gets suspended after ~6 seconds.

The device is a Honeywell Barcode reader and works perfect with our custom driver. It also gets SS in HID mode the devices can be switched to use different interfaces.

Thanks, Dieter Fauth

:)

 

Usbser.sys does not issue selective suspend as documented

Hello everybody,
coming from the What is new in usbser page. The topics mentioned there (insider) seem to have been
changed meanwhile, so I post it here.

The documentation states we have two choices for selective suspend (SS), but 0x00000001 behaves like 0x00000000:

To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:

• "0x00000001"
  
  Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
  
• "0x00000000"
  
  Enters selective suspend only when there are no open handles to the device.
  

I checked with an USB analyzer, there is no traffic, but the driver does not issue SS. If the app calls CloseHandle, then the device gets suspended after ~6 seconds.

The device is a Honeywell Barcode reader and works perfect with our custom driver. It also gets SS in HID mode (the devices can be switched to use different interfaces).

Thanks, Dieter Fauth

 

Windows 10 Bluescreen WDF_VIOLATION if USB device used USBSER.SYS and add to a Modem

We can always reproduce a bluescreen on Windows 10, if a USB device which used the USBSER.SYS driver is attached to a Windows Standard modem.



Environment:

• Windows 10 Pro, Final Build 10240, 64 Bit

Steps how to reproduce:

• Connect a USB device which used the USBSER.SYS driver
• Windows Device Manager displays the device in section "Ports (COM & LPT)"
  
  For example "Serial USB Device (COM3)"
  
  This is OK
• Start the "Phone and Modem" application
• Select the "Modems" tab and select "Add..." to "Install New Modem"
• Select "Don't detect my modem, I will select it from a list"
• Select "(Standard Modem Types)" and e.g. Model "Communication cable between two computers"
• Select the serial port which is used by the connected USB device (e.g. COM3 for this example)
• Windows starts installing the Modem... but...
• Bluescreen with information about an Error: WDF_VIOLATION
  

Notes:

• This error does not occur with USBSER.SYS driver on Windows XP, 7, 8
• I know that the USBSER.SYS driver is rewritten for Windows 10
  
  Perhaps this specific use case with the Modem assignment was not tested with this new driver?
• This bluescreen is reproducible with different connected USB devices which used the USBSER.SYS, e.g.:
  • embedded device with USB Stack from eCosCentric
  • embedded device with USB Stack from STMicroelectronics

Thanks for any help and support

Ralf Hüfing

 

Edge Search Does Not Permit Change of Region


I got these suggestions from the Microsoft Community forum.No. 1 worked for me:

Thank you for posting the query on Microsoft Community. I am glad to assist you on this.
We have reproduce the issue here and we are able to access non-regional search for google using Microsoft Edge.
I would suggest you to try the below steps and check if it helps.
Step 1:
Clear browsing data option of Microsoft Edge and check if you face the issue. To do so perform the steps below.

1. Click on the More actions icon next to the feedback icon present on top right corner of the Project Spartan homepage.
2. Select Settings and click on Choose what to clear.
3. Check the boxes Browsing history, Cookies and saved website data and Cached data and files and click on Clear.

Step 2:
I suggest you to create a new user account and check if the issue occurs.

1. Go to Settings.
2. Choose Accounts and then select Family and other users.
3. Select add someone else on this PC.
4. Enter a user name and hit next.
5. Click on Finish.
6. Sign out from the current Account and Log into the new account.

Step 3:
It could also happen because of network issue. I suggest you to try with different network connection and check if it helps.