Hello Anil Kumar H
I know there is a universal ID for USB mouse and keyboards. maybe USB Port problem? or disable it on Bios?
When I block USB Ports for Flash drives I excluded Keyboards and mouses and I haven't any problems.
Thanks.
Fatih.

its not port problem at all..

I have excluded USB k/b & mouse but some PC gives problem..

My other question was device id /class id are same on all machines or different

which is more effective in adding new hardware device in SEPM
Class id or device id

its start same for example: ACPI/PNPxxxxxxx
this xxx about OS and company id.
for example all usb drivers start with USBSTOR id
you can exclute all your mouse and keyboards ACPI/PNP*
and device ID more Usefuly.
By the way please change one pc have keyboard problem to another group in SEPM (diffrent application policy or empty application policy) that's why we can check this is application problem or not.
Thanks.
Fatih.

Found Device ID different, but class is same.

now which is more effective class id or device id

you have 2 devices with same class id but difrent device id.
when you want to block one of them you must to use device id.
this is my prefer. choice is yours :)
Thanks
Fatih.

think there are different device id's on different machine &  same class id for some USB device on different machine,

now I will bypass device id instead of class but problem is if I want to add 1 more device id of different machine which is having same USB device connected I have to add new hardware & list goes on building , is there any option where I will create 1 hardware device( is there any mulitple entries for device id i.e. ubs\xyz , usb\abc, usb\qaz etc..} & bypass all device id of different machines which is having same USB device.

Hope so u understood by doubt