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Microsoft Windows Logo Program System and Device Requirements  —  89

This capability is required so the onboard graphics device can be used in a multiple-monitor configuration and for hot undock of a docked mobile system.

For systems with integrated graphics devices that support AGP slot upgrade capability, it is acceptable for the integrated graphics to be disabled automatically. It is not a requirement that integrated devices support multimonitor when an add-on card is installed in the AGP slot.

B4. Requirements for two monitors attached to one display adapter.

For two monitors attached to one display adapter, the following items are required:

No additional memory requirements in addition to single-head memory requirements.

No AGP GART requirements on secondary head.

All minimum single-head requirements must be supported on the primary head, even though resources may vary when dual head is enabled.

Required desktop resolution for secondary head is 800 x 600 x 24 bpp. Mobile Note: Mobile minimum resolution for secondary head is 640 x 480 with 256 colors. If the secondary head supports Microsoft Direct3D®, it must support 640 x 480 at 16 bpp.

Hardware overlay is not required to work simultaneously on both monitors; however, if simultaneous hardware overlay functionality is implemented, both overlays must meet all overlay requirements.

3-D capability is required for the primary head, but isn't required for the secondary head.

If 3-D is enabled on the secondary head, it must work, even when dual head is enabled.

It is permissible to dynamically change modes; it is not permissible to fail mode changes.

Each head must support every mode that is supported when dual head is enabled.

The adapter must support enabling both heads simultaneously at 800 x 600 x 24 bpp (minimum required resolution). Mobile Note: Both heads support 640 x 480 with 256 colors simultaneously for mobile.

If one head is enabled at 800 x 600 x 24 bpp, then the other head must support the maximum resolution reported for that head without failing. Mobile Note: This is a maximum resolution of 640 x 480 x 256 colors for mobile chipsets or 640 x 480 x 16 bpp if 3-D is enabled.

No dynamic change of Direct3D capability is allowed, regardless of display mode. The primary head's Direct3D capabilities cannot change when the secondary head is enabled.

B4. Server system: Requirements for multi-monitor support if capability is implemented

For server systems, the following requirements apply only if the feature is implemented; the inclusion of the related features are not required for display adapters on server systems:

B4.1.4.2 Windows XP: Microsoft DirectX® 7 or later driver support for hardware acceleration

B4.1.4.5 Color support - (bullet 2) Adapter supports gamma correction performed in hardware at 24 bpp or 32 bpp without using VGA resources

B4.1.4.8 Adapter supports hardware-accelerated 3-D graphics

B4.1.4.2 DirectX 7 or later driver support for hardware acceleration
B4. Support CopyFourCC

The graphics adapter driver must correctly implement and act on the COPYFOURCC flag as defined by ddCaps.dwCaps2. The blt function is required to take less than 8 ms and must not be emulated in software.

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