| # 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. |
