Nouveau

Kernel[edit | edit source]

Activate the following kernel options:

Device Drivers  --->
   Graphics support  --->
      <*> Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) --->
         <*> Enable legacy fbdev support for your modesetting driver
      <M/*> Nouveau (NVIDIA) cards

Firmware[edit | edit source]

Beginning with the Kepler series (GeForce 600 and above), some cards may need to load firmware at boot time in order to operate correctly. It is recommended to build firmware that is needed into the kernel. This is the default for systems running the systemd init system.

See upstream's list of codenames to determine what firmware is necessary.

See the Linux firmware article for more information on building firmware into the kernel.

Driver[edit | edit source]

Portage uses the USE_EXPAND variable called VIDEO_CARDS to enable support for various graphics cards in packages. Setting VIDEO_CARDS to appropriate value(s) will pull in the correct driver(s):

VIDEO_CARDS="nouveau"

Substitute the name of the driver(s) to be used. Common choices include nouveau, nvidia, radeon, and intel. After setting or altering VIDEO_CARDS values remember to update the system using the following command so the changes take effect:

Udev[edit | edit source]

If NVIDIA's proprietary driver has been installed, it will have installed a udev rules file in /lib/udev/rules.d/99-nvidia.rules. When attempting to use the nouveau driver without disabling that rule file, the X11 log file fill up with a block of messages like this repeating every 10ms:

 [   180.669] (II) NOUVEAU(0): EDID vendor "SAM", prod id 430
 [   180.669] (II) NOUVEAU(0): Using hsync ranges from config file
 [   180.669] (II) NOUVEAU(0): Using vrefresh ranges from config file
 [   180.669] (II) NOUVEAU(0): Printing DDC gathered Modelines:
 [   180.669] (II) NOUVEAU(0): Modeline "1600x1200"x0.0  162.00  1600 1664 1856 2160  1200 1201 1204 1250 +hsync +vsync (75.0 kHz eP)
 [   180.669] (II) NOUVEAU(0): Modeline "800x600"x0.0   40.00  800 840 968 1056  600 601 605 628 +hsync +vsync (37.9 kHz e)
 [   180.669] (II) NOUVEAU(0): Modeline "800x600"x0.0   36.00  800 824 896 1024  600 601 603 625 +hsync +vsync (35.2 kHz e)
 [...]
 [   180.669] (II) NOUVEAU(0): Modeline "1152x864"x0.0  108.00  1152 1216 1344 1600  864 865 868 900 +hsync +vsync (67.5 kHz e)
 [   180.669] (II) NOUVEAU(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
 [   180.669] (II) NOUVEAU(0): Modeline "1280x960"x0.0  108.00  1280 1376 1488 1800  960 961 964 1000 +hsync +vsync (60.0 kHz e)
 [   180.669] removing GPU device /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card2 /dev/dri/card2
 

To prevent this (without uninstalling the x11-drivers/nvidia-drivers package), simply remove/move/rename the udev file /lib/udev/rules.d/99-nvidia.rules so that is no longer taken up by udev (see Advanced Configuration of udev). Note that the next time nvidia-drivers is updated, that file will be re-installed, so consider unmerging nvidia-drivers.

Permissions[edit | edit source]

If the acl USE flag is enabled globally and elogind is being used (default for desktop profiles) permissions to video cards will be handled automatically. It is possible to check the permissions using getfacl:

A broader solution is to add the user(s) needing access the video card to the video group:

Note that users will be able to run X without permission to the DRI subsystem, but acceleration will be disabled.

xorg.conf[edit | edit source]

The X server is designed to work out-of-the-box, with no need to manually edit X.Org's configuration files. It should detect and configure devices such as displays, keyboards, and mice.

However, the main configuration file of the X server is the xorg.conf file.

Multi-monitor problems[edit | edit source]

When the screen freezes often with possible EDID probes while using dual monitors/displays, try adding video=VGA-1:e or video=VGA-1:d (enable or disable respectively) to the GRUB_CMDLINE_LINUX_DEFAULT variable in the /etc/default/grub file. With GRUB Legacy, edit the grub.cfg file directly and add it as command line options. In either case, make sure to substitute the name of the monitor listed within dmesg or /var/log/Xorg.0.log (i.e. CRT-1, VGA-1, LVDS-1, DVI-1, ...)

For instance, on a Dell Inspiron 8100 laptop with a connected external display connected via the laptop's external VGA port, a possible command line is: video=LVDS-1:1280x1024@60 video=VGA-1:1280x1024@60. The EDID (DRM) probe on the external VGA connected display is still causing freezing during nouveau/DRM load for the author, but at least it's usable if the display is connected after GRUB is loaded and prior to the nouveau/DRM modules loading. And with the prior mentioned command line LVDS/VGA resolutions, the displays are cloned and centred with somewhat correct resolutions for cloned displays.

NVIDIA Optimus[edit | edit source]

When using a laptop with NVIDIA's Optimus technology (usually found in laptops built in 2010 and later), everything will be passed through the integrated graphics controller (usually Intel) before it gets to the discrete video card (NVIDIA), which can cause a lot of otherwise unexplained problems when enabled. There are a few ways to handle this, but the simplest is to disable Optimus through the BIOS (normally accessed by pressing F12 during boot). This will result in increased power consumption (decreased battery life, increased running temperature), as the NVIDIA card will now be handling all of the work all of the time.