This is commonly referred to as the "VGA adapter". If a system has one graphics adapter with a XPDM driver and another with a WDDM driver, then Windows Vista will choose the POST device, which is the one with VGA resources. The driver models are mutually exclusive, and Windows Vista does not allow the simultaneous loading of both an XPDM driver and a WDDM driver.
That is, all of them should either be running XPDM or WDDM. “All graphics adapters in a system must use the same display driver model. XenDesktop 4 HDX 3D for Professional Graphics 1.1 - Administrator's GuideĮxcerpt from Microsoft's MultiMonitor Support and Windows Vista article: XenDesktop HDX 3D Pro (For XenDesktop 4, see the HDX 3D Pro Graphics 1.1 Administrator’s Guide. Windows will default to the Standard VGA device.Īfter the restart, verify in the Display Adapters (Device Manager from Control Panel) that Citrix Display Driver is enabled and working. Note: Screen might flicker as the driver gets updated.Ĭlose Device Manager and restart the machine. Otherwise, select Standard VGA Graphics Adapter from the list of drivers shown and and click Next. If Show compatible hardware is selected, it lists the Standard VGA Graphics Adapter. Select Let me pick from a list of device drivers on my computer. Select Browse my computer for driver software. Right-click on it and click Update Driver Software. Select the display device using WDDM driver, which would be generally non Citrix Display driver shown in the list. Open Device Manager from Control Panel and expand Display adapters. If using a Virtual Machine (VM) or do not want to use HDX 3D Pro, the resolution is to uninstall the WDDM driver from the Vista or Windows physical or VM and install Microsoft SVGA driver. In some cases, this might be a suitable resolution for remote access to physical Windows 7 PCs, with some limitations (for example, host monitor blanking cannot be guaranteed). This is supported on physical machines (whether desktop machines or blades or rack workstations). To use WDDM driver on Vista or Windows 7, refer to XenDesktop HDX 3D Pro. To resolve this issue, complete one of the following resolutions: Resolution 1
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