1deb2d2ecSBenjamin Herrenschmidtconfig VGA_ARB 26a108a14SDavid Rientjes bool "VGA Arbitration" if EXPERT 3deb2d2ecSBenjamin Herrenschmidt default y 4deb2d2ecSBenjamin Herrenschmidt depends on PCI 5deb2d2ecSBenjamin Herrenschmidt help 6deb2d2ecSBenjamin Herrenschmidt Some "legacy" VGA devices implemented on PCI typically have the same 7deb2d2ecSBenjamin Herrenschmidt hard-decoded addresses as they did on ISA. When multiple PCI devices 8deb2d2ecSBenjamin Herrenschmidt are accessed at same time they need some kind of coordination. Please 9deb2d2ecSBenjamin Herrenschmidt see Documentation/vgaarbiter.txt for more details. Select this to 10deb2d2ecSBenjamin Herrenschmidt enable VGA arbiter. 1136028f33SMike Travis 1236028f33SMike Travisconfig VGA_ARB_MAX_GPUS 1336028f33SMike Travis int "Maximum number of GPUs" 1436028f33SMike Travis default 16 1536028f33SMike Travis depends on VGA_ARB 1636028f33SMike Travis help 1736028f33SMike Travis Reserves space in the kernel to maintain resource locking for 1836028f33SMike Travis multiple GPUS. The overhead for each GPU is very small. 1903a2c4d7SLinus Torvalds 206a9ee8afSDave Airlieconfig VGA_SWITCHEROO 21ca117d6dSRandy Dunlap bool "Laptop Hybrid Graphics - GPU switching support" 226a9ee8afSDave Airlie depends on X86 236a9ee8afSDave Airlie depends on ACPI 24343d4a79SDave Airlie select VGA_ARB 256a9ee8afSDave Airlie help 26ca117d6dSRandy Dunlap Many laptops released in 2008/9/10 have two GPUs with a multiplexer 276a9ee8afSDave Airlie to switch between them. This adds support for dynamic switching when 286a9ee8afSDave Airlie X isn't running and delayed switching until the next logoff. This 29ca117d6dSRandy Dunlap feature is called hybrid graphics, ATI PowerXpress, and Nvidia 306a9ee8afSDave Airlie HybridPower. 31