![]() As in the Windows implementation, by default all applications run through the integrated graphics processor. The open-source project Bumblebee tries to provide support for graphics-chip switching. As of May 2013, power management for discrete card is not supported, which means it cannot save battery by turning off Nvidia graphic card completely. The binary Nvidia driver added partial Optimus support in the 319.17. Nvidia's proprietary kernel blob cannot make uses of DMA BUF because of license restrictions. In the middle the free and open-source driver stack consisting of Mesa 3D and libDRM in user-space and DRM/ KMS driver in the Linux kernel. The operation may be hosted in the BIOS, and often require a reboot. Some vendors have provided hardware multiplexer solutions to completely shut off the Optimus architecture. On desktop-replacement or gaming laptops (where performance is prioritized over energy efficiency), Optimus technology has been heavily criticized. Using the IGP to output data from the discrete GPU may become a bottleneck at high framerates. The Optimus Copy Engine is a new alternative to traditional DMA transfers between the GPU framebuffer memory and main memory used by the IGP. Optimus avoids usage of a hardware multiplexer and prevents glitches associated with changing the display driver from IGP to GPU by transferring the display surface from the GPU frame buffer over the PCI Express bus to the main memory-based framebuffer used by the IGP. These can be managed using the Nvidia control panel. Predefined profiles also assist in determining whether extra graphics power is needed. CUDA Calls: CUDA applications will trigger these calls.DXVA Calls: Video playback will trigger these calls (DXVA = DirectX Video Acceleration).DX Calls: Any 3D game engine or DirectX application will trigger these calls.Specifically, it sends a signal to power-on the GPU when it finds any of the following three call types: In this context-management scheme, each application is not aware of other applications concurrently using the GPU.īy recognizing designated classes, the Optimus Routing Layer can help determine when the GPU can be utilized to improve rendering performance. This Nvidia innovation performs state and context management, allocating architectural resources as needed for each driver client (i.e., application). ![]() The Optimus Routing Layer also includes a kernel-level library for recognizing and managing specific classes and objects associated with different graphics devices. ![]() Within the hardware interface layer of the Nvidia GPU driver, the Optimus Routing Layer provides intelligent graphics management. Under Windows the Nvidia driver also provides the option to manually select the GPU in the right-click menu upon launching an executable. When less demanding applications are used, the IGP takes sole control, allowing for longer battery life and less fan noise. ![]() Even in this case, though, the integrated graphics processor (IGP) is used to output the final image. If so, the GPU is powered up from an idle state and is passed all rendering calls. When a user launches an application, the graphics driver tries to determine whether the application would benefit from the discrete GPU. A project called Bumblebee is an alternative open source implementation of Optimus support for Linux. Official supported operating systems by Nvidia are Microsoft Windows and Linux. Switching between the graphics processors is designed to be completely seamless and to happen "behind the scenes". Otherwise the application is served by a rendering context that uses the integrated GPU. When an application is being launched that is determined to benefit from the performance of the discrete GPU, the discrete GPU is powered up and the application is served by a rendering context via that GPU. The technology mainly targets mobile PCs such as notebooks. Optimus saves battery life by automatically switching the power of the discrete graphics processing unit (GPU) off when it is not needed and switching it on when needed again. Nvidia Optimus is a computer GPU switching technology created by Nvidia which, depending on the resource load generated by client software applications, will seamlessly switch between two graphics adapters within a computer system in order to provide either maximum performance or minimum power draw from the system's graphics rendering hardware.Ī typical platform includes both a lower-performance integrated graphics processor by Intel/ AMD and a high-performance one by Nvidia. JSTOR ( March 2010) ( Learn how and when to remove this template message).Please improve this article by adding secondary or tertiary sources. This article relies excessively on references to primary sources.
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