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# SPDX-License-Identifier: GPL-2.0-only config VGA_ARB bool "VGA Arbitration" if EXPERT default y depends on (PCI && !S390) help Some "legacy" VGA devices implemented on PCI typically have the same hard-decoded addresses as they did on ISA. When multiple PCI devices are accessed at same time they need some kind of coordination. Please see Documentation/gpu/vgaarbiter.rst for more details. Select this to enable VGA arbiter. config VGA_ARB_MAX_GPUS int "Maximum number of GPUs" default 16 depends on VGA_ARB help Reserves space in the kernel to maintain resource locking for multiple GPUS. The overhead for each GPU is very small. config VGA_SWITCHEROO bool "Laptop Hybrid Graphics - GPU switching support" depends on X86 depends on ACPI depends on PCI depends on (FRAMEBUFFER_CONSOLE=n || FB=y) select VGA_ARB help Many laptops released in 2008/9/10 have two GPUs with a multiplexer to switch between them. This adds support for dynamic switching when X isn't running and delayed switching until the next logoff. This feature is called hybrid graphics, ATI PowerXpress, and Nvidia HybridPower.