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This page is a translated version of the page Xorg/Hardware 3D acceleration guide and the translation is 45% complete.

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この文書はGentoo LinuxのXorgでDRMを使用して3Dアクセラレーションを動作させるためのガイドです



ハードウェア3Dアクセラレーションを利用すると3D画像の描画に貴重なCPU資源を奪う代わりにグラフィックカード上のGPUを使用して3Dレンダリングします。これはまた、ハードウェア3Dアクセラレーション無しではあなたのCPUは処理能力をかなり取り上げるMesaソフトウェアレンダリングライブラリを使用して描画することを強いられるため、ソフトウェアアクセラレーションの代わりにハードウェアアクセラレーションと呼ばれます。Xorgは2Dハードウェアアクセラレーションを一般的にサポートしていますが、3Dアクセラレーションはしばしば不足しています。3Dハードウェアアクセラレーションは3Dオブジェクトをレンダリングする必要があるゲーム、3D CAD、モデリングなどの状況で有用です。


多くの場合、バイナリドライバとオープンソースドライバが存在します。オープンソースドライバは、私たちはLinuxを使っていてオープンソースであることはその根本原則の一つであるのでより望ましいです。時にはバイナリドライバが唯一の選択肢となる場合があります。特にあなたのグラフィックカードが新しく、そのカードの機能をサポートするオープンソースドライバが書かれていない場合などです。nVidiaのグラフィックカードのバイナリドライバは x11-drivers/nvidia-drivers に、AMD/ATIのグラフィックカードのバイナリドライバは x11-drivers/ati-drivers にあります。




DRM (ダイレクト・レンダリング・マネージャ)は、ダイレクトレンダリングに必要なカーネルモジュールを追加することにより、グラフィックカードのための3Dアクセラレーションを追加するXorgの付加機能です。



  • 3dfx
  • intel
  • matrox
  • nouveau
  • rage128
  • radeon
  • mach64
  • sis300
  • via

より詳細な情報とドキュメントについてはDRI ホームページを見てください。



Xorgを動作させるためにはXorg 設定ガイドを見てください。



root #emerge --ask pciutils
root #lspci | grep AGP
# 00:01.0 PCI bridge: Intel Corp. 440BX/ZX/DX - 82443BX/ZX/DX AGP bridge (rev 03)


If your chipset is not supported by the kernel you might have some success by passing agp=try_unsupported as a kernel parameter. This will use Intel's generic routines for AGP support. To add this parameter, edit your bootloader configuration file!

Most, if not all, kernels should have these options. This was configured using a standard sys-kernel/gentoo-sources kernel.

root #ls -l /usr/src/linux
lrwxrwxrwx 1 root root 22 2007-02-14 20:12 /usr/src/linux -> linux-2.6.18-gentoo-r4

Make sure /usr/src/linux links to your current kernel.

root #cd /usr/src/linux
root #make menuconfig
KERNEL Hardware 3D acceleration options
Processor type and features --->
<*> MTRR (Memory Type Range Register) support
Device drivers --->
   Graphics support --->
   <M> /dev/agpgart (AGP Support) --->
      (The agpgart option is not present on 64-bit kernels;
      just choose your chipset support.)
      <M> Intel 440LX/BX/GX, I8xx and E7x05 support
      (Enable your chipset instead of the above.)
   <M> Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) --->
      <M> (Select your graphics card from the list)


root #make && make modules_install

Don't forget to set up grub.conf or lilo.conf and run /sbin/lilo if you use LILO.


Next, add your user(s) to the video group:

root #gpasswd -a $USER video



Hopefully just adding your user to the video group is sufficient to enable direct rendering. However, you may also need to create a file in /etc/X11/xorg.conf.d/. You can name it anything you like; just make sure it ends in .conf. Open up your favorite text editor and create a file with this inside it:

FILE /etc/X11/xorg.conf.d/10-dri.conf
Section "Device"
  Driver "radeon"
Section "dri"
  Mode 0666

Replace radeon with the name of your driver.


You will need to add the module name that your card uses to /etc/conf.d/modules to ensure that the module is loaded automatically when the system starts up.

FILE /etc/conf.d/modules
modules="intel-agp" # Substitute with your driver
If you compiled agpgart as a module, you will also need to add it to /etc/conf.d/modules.



Reboot your computer to your new kernel and login as a normal user. It's time to see if you have direct rendering and how good it is. glxinfo and glxgears are part of the x11-apps/mesa-progs package, so make sure it is installed before you attempt to run these commands.

user $startx

No need to load modules for your driver or agpgart, even if you compiled them as a module. They will be loaded automatically.

user $glxinfo | grep rendering
direct rendering: Yes

If it says "No", you don't have 3D acceleration.

user $glxgears

Test your frames per second (FPS) at the default size. The number should be significantly higher than before configuring DRM. Do this while the CPU is as idle as possible.

FPS may be limited by your screen's refresh rate, so keep this in mind if glxgears reports only about 70-100 FPS. games-fps/ut2004-demo or other 3D games are better benchmarking tools, as they give you real-world performance results.

Get the most out of direct rendering

If you want to set more features, for performance or other reasons, check out the feature matrix on the DRI web site or the features listing on Sourceforge.


It doesn't work. I don't have rendering, and I can't tell why.

Try modprobe radeon before you start the X server (replace radeon with the name of your driver). Also, try building agpgart into the kernel instead of as a module.

When I startx, I get this error: "[drm] failed to load kernel module agpgart"

That's because you compiled agpgart into the kernel instead of as a module. Ignore it unless you're having problems.

I have a Radeon, and I want TV-Out.

The drivers originally developed by the GATOS project have been merged into Xorg's codebase. You don't need anything special for TV-Out; x11-drivers/xf86-video-ati will work just fine.

It doesn't work. My card is so incredibly new and cool that it isn't supported at all.

Try out the binary drivers. For AMD cards, use ati-drivers; a listing is at http://support.amd.com/us/gpudownload/Pages/index.aspx. If those don't support it, use fbdev. It's slow, but it works.

I have a PCI card and it doesn't work. Help!

Create a config file in /etc/X11/xorg.conf.d/; name it anything you want as long as it ends in .conf. Add the following to it:

FILE /etc/X11/xorg.conf.x/10-pcimode.confAdding ForcePCI Mode
Section "Device"
  Option "ForcePCIMode" "True"