Configuring Radeon R600/R700 devices on Ubuntu Jaunty

Update, 18 Mar 2009: Ubuntu Jaunty Jackalope 9.04 and later now support R600/R700 hardware out of the box. Make sure you update to at least xserver-xorg-video-radeon 1:6.12.1-0ubuntu1, libdrm2 2.4.5-0ubuntu2, and linux-image-generic 2.6.28.11.11. If you have done so, you can stop reading this page now.

Update, 5 Mar 2009: fixed the instructions for the DRM modules. You need to build from the origin/r6xx-r7xx-support branch.

I got a new computer with an ATI Radeon 3450 graphics card (R600 series). Here are the steps I took to configure it on Ubuntu Jaunty Jackalope 9.04 using free software (open source) drivers. The instructions below might also be useful for other Radeon hardware, in particular, R700-series cards.

Happily, Ubuntu 9.04 does drive the 3450 out-of-the-box (it boots into X and is usable, using the free radeon driver). Its performance was, however, kind of poor on my machine. I noticed "wiping" and flickering when scrolling (e.g. in firefox or gnome-terminal) or moving windows around.

Building the development versions of the radeonhd and drm drivers fixed these issues and significantly improved desktop performance. Everything is quite slick-looking now, even while driving a 1900x1080 display. Kudos to the driver developers, and to AMD/ATI for cooperating with driver development. Ubuntu does package radeonhd, so sooner or later, after this code gets released, an out-of-the-box installation will provide this level of performance as well.

For historical reasons there are two free drivers for ATI Radeon devices: radeon and radeonhd. They have approximate feature-parity these days. I used radeonhd because I found instructions for it first. :) Instructions are adapted from these sources: radeonhd r600-r700 instructions, Ubuntu community documentation for RadeonHD. (For your reference, the Radeon feature matrix describes what features are supported on what models.)

Download the build prerequisites:

$ sudo aptitude install git-core build-essential
$ sudo aptitude build-dep xserver-xorg-video-radeonhd

Clone the repos for radeonhd and drm:

$ git clone git://anongit.freedesktop.org/git/xorg/driver/xf86-video-radeonhd
$ git clone git://anongit.freedesktop.org/mesa/drm

Build and install radeonhd:

$ cd xf86-video-radeonhd
$ ./autogen.sh --prefix=/usr
$ make
$ sudo make install
$ cd ..

Build and install the drm modules:

$ cd drm/linux-core
$ git checkout origin/r6xx-r7xx-support
$ make radeon.o drm.o
$ sudo cp radeon.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/radeon/
$ sudo cp drm.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/

Now we'll configure X to use the new drivers. If you don't have an xorg.conf file with stuff in it, auto-generate one:

# X -configure
# mv /root/xorg.conf.new /etc/X11/xorg.conf

Change the Device section. I modified the Driver line and added the following options:

Section "Device"
    Driver "radeonhd"
    Option "AccelMethod" "exa"
    Option "DRI" "on"
    Option "VideoOverlay" "off"
    Option "OpenGLOverlay" "on"
    Option "TexturedVideo" "off"
    [...]
EndSection

Verify that the DRI module is loaded and that non-root applications can access it:

Section "Module"
    Load  "dri"
    [...]
EndSection

Section "DRI"
    Mode 0666
EndSection

Then reboot your computer. That should do it.

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