Difference between revisions of "Package:Radeon Video Drivers"

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(Removed kernel option for 'Enable userspace modesetting' as it is deprecated now. Added information about eliminating screen tearing.)
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# ##i##emerge linux-firmware
# ##i##emerge linux-firmware
Notice, that you need to choose either firmware package.
=== Installing the firmware into the kernel ===
=== Installing the firmware into the kernel ===

Revision as of 04:02, June 6, 2015

Radeon Video Drivers


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If you have become frustrated by the somewhat poorly maintained ati-drivers (the closed source video drivers for AMD cards) or if you would rather use open source video drivers, this is the package for you. This page outlines how to install and configure the open source xf86-video-ati drivers.


Check to see if your card is an AMD card

If you do not know if you have an AMD graphics card or not, you can run the following command:

root # lspci | grep VGA

If the output produces information that contains something like "01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Pitcairn PRO [Radeon HD 7850]," then you have an AMD graphics card and continue to the next step in the install process. If lspci does not provide you with something like this, and instead contains Intel or NVIDIA, consult the main Video page for information.

Preparing the kernel

Now that you know you have an AMD graphics card, you can prepare the kernel for xf86-video-ati. Begin by ensuring that MTRR is enabled, then enable support for AGP graphics cards (only necessary if your card sits in an AGP slot -- not a PCIe one). After enabling AGP (if you needed it), you should enable support for the DRM and modesetting on radeon.:

Processor type and features --->
    [*] MTRR (Memory Type Range Register) support

Device Drivers --->
    Graphics support --->
        (If you have an AGP-based graphics card, enable these options)
        <*> /dev/agpgart (AGP Support) --->
            <*> AMD Opteron/Athlon64 on-CPU GART support
        Direct Rendering Manager --->
            <*> Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) ----
            <*> ATI Radeon
        Frame buffer Devices --->
            < > ATI Radon display support

If you have a graphics cards with HDMI ports that you wish to use for audio, some additional configuration of the kernel is required:

Device Drivers --->
    <*> Sound card support --->
        <*> Advanced Linux Sound Architecture --->
            HD Audio --->
                <*>HD Audio PCI
                    (64) Pre-allocated buffer size for HD-audio drivers
                    <*> Build HDMI/DisplayPort HD-audio codec support
        [*] Dynamic device file minor numbers
        (32) Max number of sound cards

Getting the required firmware

Many newer AMD GPU's require that you install firmware for them to function. Install the package radeon-ucode (Radeon microcode) for this function:

root # emerge radeon-ucode

It is also possible to install Radeon microcode via the linux-firmware package, which contains the Radeon microcode plus a much larger selection of firmware for other types of devices:

root # emerge linux-firmware

Notice, that you need to choose either firmware package.

Installing the firmware into the kernel


This section is in need of updates.

Until this section has been fixed, you'll find help at http://wiki.gentoo.org/wiki/Radeon#Firmware

Eliminating screen tearing

With a compositor

Some machines will suffer from screen tearing with the open source xf86-video-ati driver. It is possible to solve this by running a compositor. Many desktop environments provide their own compositor but if you still have tearing or don't use a desktop environment then screen tearing can be solved by running Compton with an option such as --opengl.

In order to have this started automatically every time you log in you can append the following:

compton --opengl &

Without a compositor

Screen tearing can be eliminated natively without the need to a compositor but currently this can only be achieved with the git version of xf86-video-ati. There was recently was a commit which, when the appropriate option has been enabled in your xorg configuration, enables tear free video playback natively.

You need to install x11-drivers/xf86-video-ati-9999 which can be obtained from the x11 overlay.

Then add the tearfree option to the xorg conf file:

   /etc/X11/xorg.conf.d/radeon.conf - An example conf file for the radeon driver
Section "Device"
   Identifier  "radeon"
   Driver      "radeon"
   Option      "TearFree" "true"