Specifications

2
Functional Description
2.1 Fixed Switchable Graphics Scheme
The fixed scheme will not be supported on Intel Chief River platforms, AMD
“Comal” platforms, as well as future platforms that follow them. On 2011 designs,
such as Intel Huron River platforms and AMD “Sabine” platforms, the fixed scheme
and scheme switching between dynamic and fixed remain unchanged from PX4.0.
For a detailed functional description of PX4.0, please refer to the Muxless ATI
TM
Switchable Graphics PX4.0 Functional Specification for
Intel platforms and AMD
Platform Switchable Graphics and Dual Graphics Design Guidance and Functional
Specification, revision 1.5, for AMD platforms.
2.1.1 Hardware Requirement
On designs where the fixed scheme is supported, dGPU power-down hardware
implementation is required.
Details are found in dGPU Power-down Implementation (for the Dynamic-zero or the
Fixed Scheme).
2.1.2 SBIOS Requirement
• Bit 9 in SBIOS ATPX function 1 (Get AMD PowerXpress™ Parameters) is used
to indicate whether the fixed scheme is supported on the platform.
• On designs where the fixed scheme is not supported, bit 9 must be set to 1.
For SBIOS ATPX function descriptions, please refer to Switchable Graphics ACPI
Control Methods, revision 0.26, for Intel platforms and AMD PowerXpress ACPI
Control Methods, revision 0.26A, for AMD platforms.
Details are found in SBIOS Requirements.
2.2 Dynamic Switchable Graphics Scheme
Under the dynamic mode, the user does not directly control which graphics device is
active. The render-graphics device is determined by application profile settings and
the default rule.
• Displays are always exposed to the OS through integrated graphics.
• Aero desktop always runs on integrated graphics.
©
2011 Advanced Micro Devices, Inc.
Proprietary and Confidential - Do not duplicate.
Muxless Switchable Graphics Technology PX5.0 Functional Specification
137-41940-10