| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | config VGA_ARB |
| 3 | bool "VGA Arbitration" if EXPERT |
| 4 | default y |
| 5 | depends on (PCI && !S390) |
| 6 | help |
| 7 | Some "legacy" VGA devices implemented on PCI typically have the same |
| 8 | hard-decoded addresses as they did on ISA. When multiple PCI devices |
| 9 | are accessed at same time they need some kind of coordination. Please |
| 10 | see Documentation/gpu/vgaarbiter.rst for more details. Select this to |
| 11 | enable VGA arbiter. |
| 12 | |
| 13 | config VGA_ARB_MAX_GPUS |
| 14 | int "Maximum number of GPUs" |
| 15 | default 16 |
| 16 | depends on VGA_ARB |
| 17 | help |
| 18 | Reserves space in the kernel to maintain resource locking for |
| 19 | multiple GPUS. The overhead for each GPU is very small. |
| 20 | |
| 21 | config VGA_SWITCHEROO |
| 22 | bool "Laptop Hybrid Graphics - GPU switching support" |
| 23 | depends on X86 |
| 24 | depends on ACPI |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 25 | depends on PCI |
| 26 | depends on (FRAMEBUFFER_CONSOLE=n || FB=y) |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 27 | select VGA_ARB |
| 28 | help |
| 29 | Many laptops released in 2008/9/10 have two GPUs with a multiplexer |
| 30 | to switch between them. This adds support for dynamic switching when |
| 31 | X isn't running and delayed switching until the next logoff. This |
| 32 | feature is called hybrid graphics, ATI PowerXpress, and Nvidia |
| 33 | HybridPower. |