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How to I address a specific graphics card on Linux (X11)?

April 26, 2017address card graphics linux X11

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How to I address a specific graphics card on Linux (X11)?

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• A: The graphics card is selected using XOpenDisplay. Typically one X server is used for all cards, and the card is addressed using the screen number, i.e. the number after the dot in the display name (“:0.[screen]”). Sometimes one X server is used for each card, in which case the GPU’s can be addresses using the server number in the display name (“:[server].0”).