Nouveau Kernel Module Parameters

Each of these parameters expects a value. Most are simple booleans, and can be set with foo=1 for enable or foo=0 for disable. The rest have detailed explanations of the values they're allowed to take on.

perflvl/perflvl_wr (removed in 3.13)

Specify nouveau.perflvl_wr=7777 in order to be able to switch performance levels at runtime via /sys/class/drm/cardN/device/performance_level. You can also specify nouveau.perflvl=N to switch to a specific performance level on boot.

pstate (removed in 4.5)

Specify nouveau.pstate=1 in order to be able to switch performance levels at runtime via /sys/class/drm/cardN/device/pstate. Starting in 4.5, this is available by default in debugfs, at /sys/kernel/debug/dri/*/pstate

WARNING: Power management is a very experimental feature and is not expected to work. If you decided to upclock your GPU, please aknowledge that your card may overheat. Please check the temperature of your GPU at all time!


Force enable 1 or disable 0, runtime power-managment. The default only for Optimus systems is -1.


Disable kernel/abi16 acceleration (i.e. 1 for disable acceleration, 0 for enable).


Disable fbcon acceleration (i.e. 1 for disable acceleration, 0 for enable).


Whether the driver should be enabled. 0 for disabled, 1 for enabled, 2 for headless


This provides a way to configure various parts of the driver, it is a comma-separate list of a=b key/value pairs. The values are all integers (use 0/1 for booleans) except for NvBios which is a string.

  • $engine: Whether to enable/disable the engine, e.g. PDISP=0
  • NvAGP: The agp mode (0 for disable) to force (starting with 4.3)
  • NvBios: Specify VBIOS source as one of OpenFirmware/PRAMIN/PROM/ACPI/PCIROM/PLATFORM, or a filename passed to request_firmware
  • NvBoost: Specify the Boost mode for Fermi and newer. 0: base clocks (default) 1: boost clocks 2: max clocks (starting with 4.9)
  • NvClkMode: Force a particular clock level on boot. Note that this does not parse hex, so for clock mode f, pass in 15.
  • NvClkModeAC: Same as NvClkMode, when the power is plugged in
  • NvClkModeDC: Same as NvClkMode, when running off battery
  • NvFanPWM: Enable use of PWM for the fan, auto-detect by default
  • NvForcePost: Whether to force a POST of the device, off by default
  • NvGrUseFW: Whether to load FW for PGRAPH on NVC0
  • NvI2C: ??, off by default
  • NvMemExec: Perform memory reclocking
  • NvMSI: Use MSI interrupts, on by default on the chipsets that support it
  • NvMXMDCB: Sanitize DCB outputs from the BIOS, on by default
  • NvPCIE: NV40 family only, whether to use PCI-E GART, on by default

Here is a list of engines:

  • PBSP
  • PCE0
  • PCE1
  • PCE2
  • PPM
  • PPPP
  • PVP
  • SW


This works just like the config option, but the values are all debug levels (one of fatal, error, warn, info, debug, trace, paranoia, spam). Note that in order for a debug level to work, CONFIG_NOUVEAU_DEBUG must be set to at least that level.

  • $subdev (e.g. PDISP=debug)

Here is a list of the available subdevices:

  • GPIO
  • I2C
  • MXM
  • PBUS
  • any engine (see above)

Example: nouveau.debug="PTHERM=debug,PTIMER=debug"

agpmode (removed in 4.3)

AGP mode, 0 to disable AGP


Create DMA push buffers in VRAM


Ignore ACPI lid status

Allow dual-link TMDS (on by default)


Default TV norm. Default is PAL. Valid values: PAL, PAL-M, PAL-N, PAL-Nc, NTSC-M, NTSC-J, hd480i, hd480p, hd576i, hd576p, hd720p, hd1080i.

This only applies to cards that don't have external encoders.


Disable TV-out detection