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_wr (removed in 3.13)
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)
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
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
NvBios: Specify VBIOS source as one of
OpenFirmware/PRAMIN/PROM/ACPI/PCIROM/PLATFORM, or a filename passed to request_firmware
NvClkMode: Force a particular clock level on boot. Note that this does not parse hex, so for clock mode
f, pass in
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
NvAGP: The agp mode (0 for disable) to force (starting with 4.3)
Here is a list of engines:
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:
- any engine (see above)
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