The quickest method to determine if your device uses an Optimus card is to search against the documented list on NVIDIA's website. PRIME Render Offload with an External Display.There appears to be no way to query the system for this information, which leaves trial and error: try the configurations for each hardware variant until one works. In order to take advantage of Optimus and also have full use of external displays, different configuration is required depending on the hardware variant. The situation is further complicated by the fact that some laptop models have all external display connectors hardwired to the onboard GPU the same way the internal screen is, some have all external display connectors wired to the discrete GPU, and some have a mix. Due to the nature of this technology, various software components must be aware of, and configured for, the proper output of the display based on the user's desired configuration. NVIDIA Optimus is a technology that enables dynamic, switchable graphics between the central processing unit's (CPU) embedded graphics capability and the discrete graphics processing unit (GPU) card. This page describes how to identify, configure and troubleshoot NVIDIA Optimus enabled systems for Debian.

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Nvidia drivers debian