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 PostPost subject: An interesting detail in "Longhorn" graphics requirements        Posted: Mon Jan 29, 2018 11:23 pm 
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Sun Jul 01, 2012 7:32 am



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When browsing the pre-reset WinHEC 2004 Graphics Hardware and Drivers for Windows "Longhorn" article, I noticed an interesting detail related to WDDM drivers:
Longhorn will not support multiple graphics adapters from different vendors in the same system.

The same limitation is observed after the development reset with WDDM in Windows Vista. For instance, MultiMonitor Support and Windows Vista states:
If multiple graphics adapters are present in a system, all of them must use the same WDDM driver. If there are two graphics adapters with WDDM drivers from two different manufacturers, then Windows will disable one of them. The VGA adapter will be enabled, and the second device will be disabled.

This limitation was lifted with the release of Windows 7 and WDDM 1.1.

The detail is worth noting in an objective overview of pre-reset "Longhorn" with its features and limitations.

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