drivers/gpu/vga/Kconfig

   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.