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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.
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