1# SPDX-License-Identifier: GPL-2.0-only
   2config 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.
  13config 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.
  22        bool "Laptop Hybrid Graphics - GPU switching support"
  23        depends on X86
  24        depends on ACPI
  25        depends on PCI
  26        depends on (FRAMEBUFFER_CONSOLE=n || FB=y)
  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.