If your signature pad is displaying a yellow mark in Device Manager, you must install the driver for that pad. Click this link for the driver: https://acct90501.secure.netsuite.com/c.ACCT90501/FTP/CDM20814_Setup.exe
Unfortunately this is hardware issue that can not be fixed via update or calibration. Please contact Ambir Support to check the warranty status of that device.
We can offer a Linux SDK which includes low-level driver (LLD) and sample code demonstrating its use. It is recommended for developers who are writing their own application to run in a Linux environment. If you would like to request a linux driver ...