| 1 | config VGA_ARB |
| 2 | bool "VGA Arbitration" if EXPERT |
| 3 | default y |
| 4 | depends on (PCI && !S390) |
| 5 | help |
| 6 | Some "legacy" VGA devices implemented on PCI typically have the same |
| 7 | hard-decoded addresses as they did on ISA. When multiple PCI devices |
| 8 | are accessed at same time they need some kind of coordination. Please |
| 9 | see Documentation/vgaarbiter.txt for more details. Select this to |
| 10 | enable VGA arbiter. |
| 11 | |
| 12 | config VGA_ARB_MAX_GPUS |
| 13 | int "Maximum number of GPUs" |
| 14 | default 16 |
| 15 | depends on VGA_ARB |
| 16 | help |
| 17 | Reserves space in the kernel to maintain resource locking for |
| 18 | multiple GPUS. The overhead for each GPU is very small. |
| 19 | |
| 20 | config VGA_SWITCHEROO |
| 21 | bool "Laptop Hybrid Graphics - GPU switching support" |
| 22 | depends on X86 |
| 23 | depends on ACPI |
| 24 | select VGA_ARB |
| 25 | help |
| 26 | Many laptops released in 2008/9/10 have two GPUs with a multiplexer |
| 27 | to switch between them. This adds support for dynamic switching when |
| 28 | X isn't running and delayed switching until the next logoff. This |
| 29 | feature is called hybrid graphics, ATI PowerXpress, and Nvidia |
| 30 | HybridPower. |