Difference between revisions of "Nouveau"

Revision as of 14:44, 10 December 2012

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This article covers installing and configuring the Nouveau open source driver for NVIDIA graphic cards. For information about the official proprietary driver, see NVIDIA.

Do not forget to check out the Nouveau FAQ if you have any questions, as there is a lot of valuable information there.

Installation

Before proceeding, have a look at the FeatureMatrix to see what features are supported for a given architecture, and the list of codenames to determine the card's category. You could also consult Wikipedia for an even more detailed list.

If you already installed the proprietary NVIDIA driver, then remove it first:

# pacman -Rdds nvidia nvidia-utils
# pacman -S --asdeps libgl

Install the DDX driver with the xf86-video-nouveau package.

Also make sure you have Xorg properly installed.

If you want hardware-accelerated 3D support (to run GNOME Shell or KWin's effects, for instance), install the DRI driver with the nouveau-dri package. For Arch x86_64, install lib32-nouveau-dri from the Multilib repository, as well.

Loading

The Nouveau kernel module should load fine automatically on system boot.

If it does not happen, then:

• Make sure you do not have nomodeset or vga= as a kernel parameter, since Nouveau needs kernel mode-setting in order to run successfully (see below).
• Also, check that you have not disabled Nouveau by using any modprobe blacklisting within /etc/modprobe.d/.

KMS

Kernel Mode Setting (KMS) is required by the Nouveau driver. As the system boots, the resolution will likely change when KMS initializes the display driver. Simply installing the Nouveau driver should be enough to get the system to recognize and initialize it in "Late start" mode (see below). See the Nouveau KernelModeSetting page for more details.

Late start

This method will start the KMS after the other kernel modules are loaded. You will see the text "Loading modules" and the size of the text may change, possibly with an undesirable flicker.

Early start

This method will start the KMS as early as possible in the boot process, when the initramfs is loaded.

To do this, add nouveau to the MODULES array in /etc/mkinitcpio.conf:

MODULES="... nouveau ..."

Re-generate the initial ramdisk image:

# mkinitcpio -p <kernel preset; e.g. linux>

If you're experiencing troubles with Nouveau leading to rebuild nouveau-drm several times for testing purposes, do not add nouveau to the initramfs. It is too easy to forget to rebuild the initramfs and it will just make any testing harder. Just use "Late start" until you are confident the system is stable. There might be additional problems with initramfs if you need a custom firmware (generally not advised).

Tips and tricks

Keep NVIDIA driver installed

If you want to keep the proprietary NVIDIA driver installed, but want to use the Nouveau driver, comment out nouveau blacklisting in /etc/modprobe.d/nouveau_blacklist.conf modifying it as follows:

#blacklist nouveau

And tell Xorg to load nouveau instead of nvidia by creating the file /etc/X11/xorg.conf.d/20-nouveau.conf with the following content:

Section "Device"
    Identifier "Nvidia card"
    Driver "nouveau"
EndSection

If you already used the NVIDIA driver, and want to test Nouveau without reboot, make sure the 'nvidia' module is no longer loaded:

# rmmod nvidia

Then load the 'nouveau' module:

# modprobe nouveau

And check that it loaded fine by looking at kernel messages:

$ dmesg

Installing the latest development packages

You may install the latest -git packages, through AUR:

• You can use mesa-git^AUR which will allow the installation of the latest Mesa (including the latest DRI driver).
• You can use xf86-video-nouveau-git^AUR which will allow the installation of the latest DDX driver.
• You can also try installing a newer kernel version, through packages like linux-mainline^AUR in which the Nouveau DRM code would allow better performance.
• To get the latest Nouveau improvements, you should use the linux-git^AUR package from the AUR, edit the PKGBUILD and use Nouveau's own kernel repository, which is currently located at: git://anongit.freedesktop.org/nouveau/linux-2.6.

Upsteam driver sources can be found at the Nouveau Source page.

Tear-free compositing

Edit your /etc/X11/xorg.conf.d/20-nouveau.conf, and add the following to the Device section:

Section "Device"
    Identifier "nvidia card"
    Driver "nouveau"
    Option "GLXVBlank" "true"
EndSection

Dual Head

Nouveau supports the xrandr extension for modesetting and multiple monitors. See the RandR12 page for tutorials.

Here is a full sample /etc/X11/xorg.conf.d/20-nouveau.conf above for running 2 monitors in dual head mode. You may prefer to use a graphical tool to configure monitors like GNOME Control Center's Display panel (gnome-control-center display).

# the right one
Section "Monitor"
          Identifier   "NEC"
          Option "PreferredMode" "1280x1024_60.00"
EndSection

# the left one
Section "Monitor"
          Identifier   "FUS"
          Option "PreferredMode" "1280x1024_60.00"
          Option "LeftOf" "NEC"
EndSection

Section "Device"
    Identifier "nvidia card"
    Driver "nouveau"
    Option  "Monitor-DVI-I-1" "NEC"
    Option  "Monitor-DVI-I-2" "FUS"
EndSection

Section "Screen"
    Identifier "screen1"
   Monitor "NEC"
    DefaultDepth 24
      SubSection "Display"
       Depth      24
       Virtual 2560 2048
      EndSubSection
    Device "nvidia card"
EndSection

Section "ServerLayout"
    Identifier "layout1"
    Screen "screen1"
EndSection

Setting console resolution

Use the fbset tool to adjust console resolution.

You can also pass the resolution to nouveau with the video= kernel line option (see KMS).

Power Management

GPU Scaling is in various stages of readiness depending on the GPU. See the Nouveau PowerManagement page for more details.

Enable MSI (Message Signaled Interrupts)

This may provide a slight performance advantage. It is only supported on NV50+ and is disabled by default.

Place the following in /etc/modprobe.d/nouveau.conf:

options nouveau msi=1

If using early start, add the line FILES="/etc/modprobe.d/nouveau.conf" to /etc/mkinitcpio.conf, then re-generate kernel image:

# mkinitcpio -p <kernel preset; e.g. linux>

Reboot the system for the changes to take effect.

Troubleshooting

Add the following to your kernel command line (if using grub hit Template:Keypress at the boot menu to edit) to turn on video debugging:

drm.debug=14 log_buf_len=16M

Create verbose Xorg log:

startx -- -logverbose 9 -verbose 9

View loaded video module parameters and values:

modinfo -p video