• 4k@60Hz CVT-RB
• Fixes unstable HDMI at 4K@60Hz, and overly-bright colors on DisplayPort
• The grep here confirms the expected Modeline ¹⁾
• This cannot be used on Wayland currently
• This expects amdgpu DDX driver to be used ²⁾

cvt --verbose --reduced '3840' '2160' '60' | grep 'Modeline "3840x2160R"  533.00  3840 3888 3920 4000  2160 2163 2168 2222 +hsync -vsync'

sudo -e '/etc/X11/xorg.conf.d/99-graphics.conf'

Section "Monitor"
    Identifier      "HDMI-A-0"
    Modeline "3840x2160R"  533.00  3840 3888 3920 4000  2160 2163 2168 2222 +hsync -vsync
    Option          "PreferredMode" "3840x2160R"
EndSection

• The lack-of quotes around 30 is intentional and required syntax
• This may cause minor issues with programs not expecting 30-bit color ³⁾
• This can cause games in Wine to not start under some circumstances ⁴⁾
• There is no known benefit to enabling this as of 2019/10/22

sudo -e '/etc/X11/xorg.conf.d/99-graphics.conf'

Section "Screen"
    Identifier      "Deep Color Screen"
    DefaultDepth    30
EndSection

sudo dnf install 'xorg-x11-drv-amdgpu' -y && sudo -e '/etc/X11/xorg.conf.d/99-graphics.conf'

Section "OutputClass"
    Identifier  "AMD Graphics"
    MatchDriver "amdgpu"
    Driver      "amdgpu"
    Option      "DRI"       "3"
    Option      "TearFree"  "0"
EndSection

sudo dnf install 'xorg-x11-drv-intel' -y && sudo -e '/etc/X11/xorg.conf.d/99-graphics.conf'

Section "OutputClass"
    Identifier  "Intel Graphics"
    MatchDriver "i915"
    Driver      "intel"
    Option      "DRI"       "3"
    Option      "TearFree"  "0"
EndSection

sudo dnf install 'xorg-x11-drv-nouveau' -y && sudo -e '/etc/X11/xorg.conf.d/99-graphics.conf'

Section "OutputClass"
    Identifier  "NVIDIA Graphics"
    MatchDriver "nouveau"
    Driver      "nouveau"
    Option      "DRI"       "3"
EndSection

• Expects pre-SI GPUs ⁵⁾
• For SI, CIK, and newer GPUs, use amdgpu, along with enabling si_support and cik_support respectively for the amdgpu kernel module ⁶⁾

sudo dnf install 'xorg-x11-drv-ati' -y && sudo -e '/etc/X11/xorg.conf.d/99-graphics.conf'

Section "OutputClass"
    Identifier  "AMD Graphics"
    MatchDriver "radeon"
    Driver      "radeon"
    Option      "DRI"               "3"
    Option      "SwapbuffersWait"   "0"
    Option      "TearFree"          "0"
    Option      "AccelMethod"       "EXA"
EndSection