[maxik@m-Arch ~]$ cat /etc/X11/xorg.conf
#Section "Module"
#       Load "dri2"
#       Load "glamoregl"
#EndSection
Section "Device"
    Identifier "Radeon"
    Driver "radeon"
    Option "ColorTiling" "on"
    Option "DRI3" "on"
    Option "DRI" "3"
    #Option "EnablePageFlip" "on"
    #Option "AccelMethod" "Glamor"
EndSection
Section "Screen"
    Identifier             "Screen0"  #Collapse Monitor and Device section to Screen section
    Device                 "Device0"
    Monitor                "Monitor0"
#    DefaultDepth           24 #Choose the depth (16||24)
    SubSection             "Display"
#        Depth              24
        Modes              "1920x1080" #Choose the resolution
    EndSubSection
EndSection
[maxik@m-Arch ~]$ cat /var/log/Xorg.0.log | grep DRI3
[    19.135] (WW) RADEON(0): Option "DRI3" is not used