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Knowledge Base

WAN Optimization for USB redirected Wacom signature pad devices (70733)

Last Updated: 12/8/2022Categories: InformationalTotal Views: 6761Language:
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Symptoms

Currently, USB redirected Signature Pads, Drawing Tablets are unusable in WAN. You will notice latency and lagging issue while using these devices under WAN network conditions.

If you are using Horizon 8 2006, or  Horizon 7.13.X, then this KB article will help you optimize the end-user experience.

Important: We recommend you migrate from Horizon 7 to Horizon 8 as soon as possible. Horizon 8 offers numerous improvements in performance, scale, and experience for both Administrators and end users. Please see Ensuring a successful migration from Horizon 7 to Horizon 8 (89840)  for additional advice.

If you are using Horizon 8 2012 or newer, please see https://blogs.vmware.com/euc/2021/02/smooth-signature-support-in-vmware-horizon.html and the Horizon Agent GPO entitled Include HID Optimization Vid/Pid Device.

Purpose

With this optimization, we will enable USB redirected Signature Pads and Drawing Tablets devices in WAN.

Cause

The combination of the network latency and the PING/PONG mechanism of HID class drivers is the root cause. In short, with 200 ms network delay, the application and HID software stack in Agent get only about 10 samples while about 125 samples are expected with ideal network condition(or locally attached USB devices). As most of the samples are lost, the redirected HID devices are nearly unusable.

Resolution

Optimization switch:

Important: This optimization switch is only applicable for VDI desktop.  Wacom tablets and similar devices are not supported in RDSH or in Physical Agent scenarios.

The optimization is OFF by default.

The enable the optimization, navigate to the following path in the registry on the VDI desktop:

HKLM\Software\Policies\VMware, Inc.\VMware VDM\

Create the key USB if it does not already exist.

Inside the USB key, create a key of the Vid/Pid for the device in question in the following format:

Vid_xxxx&Pid_yyyy

Inside the Vid/Pid key, create D-WORD 32-bit Value:

DeviceFlags : 0x00040000

Example:  A Wacom Intuos Pro is VID-056A_PID-0392.  This can be found by investigating the device properties from a Client machine.  The new registry entry will look as follows:

Note: Above registry changes do NOT require reboot or reconnect of Agent. Un-redirect the device and redirect the device will pick up the latest value.

To confirm the setting is taken, connect to the VDI desktop and look at the most recent log file in c:\programdata\vmware\vdm\logs.  Look for the line:

vhublib: Effective configuration setting, name: DeviceFlags, value: 262144

Detectable by VMware SkylineTM

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