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Intel and AMD (Radeon HD 4350/4550): two GPUs, three screens

Posted 10-11-2019 at 06:22 PM by trevorparsons
Updated 10-11-2019 at 06:28 PM by trevorparsons

After a lot of trial and error and reading of wikis and forum posts, I've got three screens running out of two GPUs with full acceleration throughout.

I'm running Arch Linux on a Gigabyte H81M-DS2V motherboard with an Intel Core i7-4790 featuring Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics.

Plugged in to the PCIe slot is an AMD/ATI RV710 [Radeon HD 4350/4550] graphics card.

I have xf86-video-ati and xf86-video-intel installed.

In the BIOS I have IGFX (the Intel integrated graphics) set to be the primary output.

To get the graphics drivers loaded as soon as possible, in /etc/mkinitcpio.conf I have...

 MODULES=(radeon i915)
...having added which I regenerated the initial ramdisk thus:

mkinitcpio -g /boot/initramfs-linux.img
In /etc/X11/xorg.conf.d/ I have made two text files.

One is entitled 20-intel.conf and contains

        Identifier  "Intel Graphics"
        Driver      "intel"
        Option      "DRI" "2"             # DRI3 is now default 
        #Option      "AccelMethod"  "sna" # default
        Option      "AccelMethod"  "uxa" # fallback
The other is entitled 20-radeon.conf and contains

Section "Device"
    Identifier "Radeon"
    Driver "radeon"
    Option "ColorTiling" "on"
    Option "ColorTiling2D" "on"
    Option "DRI" "3"
Rebooted. Logged into Plasma via SDDM. Everything works nicely.

Running glxgears from a terminal, the cogs turn smoothly on all screens. On the Intel GPU-powered screen the glxgears demo, with the window maximised, reports about 60FPS and on the AMD/ATI-powered screens it reports about 310FPS.
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