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The vgaarb is a module of the Linux Kernel. When it is initially loaded, it
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scans all PCI devices and adds the VGA ones inside the arbitration. The
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arbiter then enables/disables the decoding on different devices of the VGA
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explicitly tell it by calling vga_set_legacy_decoding().
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The kernel exports a char device interface (/dev/vga_arbiter) to the clients,