Hi Dunc,
Welcome,
As Soultribunal rightly said, the Intel HD Graphics driver is available to support the onboard video in your system. In case if you are not using a discrete video card, the onboard video would run with the help of Intel HD Graphics driver.
As you have told that you are using a discrete video card (Radeon 6900 series), therefore, your system is currently using the discrete video card driver. However, in case if you ever need to use the onboard graphics, you would need the Intel HD Graphics driver. Therefore, I would advise you as not to uninstall this driver from your system.
I hope the link mentioned below would further answer your queries related to the Intel HD Graphics driver:
Graphics — Intel® graphics driver FAQ
Glad to Help.
Thanks & Regards,
DELL_Abhishek_V
Dell Social Media Responder