• Anything here expects Xorg and not Wayland
• Identifier will need changed for different display connections and drivers

• 99-graphics.conf

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

• See Acer S271HL

• Last updated: 2022/05/18
• This expects modesetting ¹⁾

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

Section "Monitor"
    Identifier "HDMI-1"
    Modeline "1920x1080_75"  167.85  1920 1928 1960 2000  1080 1105 1113 1119 +hsync -vsync
    Option "PreferredMode" "1920x1080_75"
EndSection

• https://blogshit.baka.fi/2020/07/xorg-custom-resolutions/
• https://download.nvidia.com/XFree86/Linux-x86_64/510.54/README/xconfigoptions.html

Section "Monitor"
    Identifier "S271HL-75Hz"
    Modeline "1920x1080_75"  167.85  1920 1928 1960 2000  1080 1105 1113 1119 +hsync -vsync
EndSection

Section "Screen"
    Identifier "Screen0"
    Option "ModeValidation" "DP-1: NoMaxPClkCheck,NoEdidMaxPClkCheck,NoHorizSyncCheck,NoVertRefreshCheck,AllowNonEdidModes"
    Monitor "S271HL-75Hz"
EndSection

• Reduces HDMI bandwidth for 4K@60Hz
• Fixes Polaris HDMI instability and incorrect brightness with certain DisplayPort-to-HDMI cables
• Only for amdgpu, as modesetting presents a CVT-RB resolution automatically

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

• https://wiki.gentoo.org/wiki/30bpp
• https://wiki.archlinux.org/title/AMDGPU#10-bit_color
• The lack-of quotes around 30 is intentional and required syntax
• This may cause apps to crash

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

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

• This may need changed to 0 instead for some distros

cat ~/'.local/share/xorg/Xorg.1.log' | grep 'Pixel depth'

cat ~/'.local/share/xorg/Xorg.1.log.old' | grep 'Pixel depth'

• TODO, this was figured out in order to use modesetting without uninstalling specific DDX drivers

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

• 2022/05/27: Diablo II: Resurrected has screen-tearing even with Vsync enabled in-game and TearFree=1 when using amdgpu, but is fine with modesetting
• No known benefits over modesetting

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

Section "OutputClass"
    Identifier  "AMD Graphics"
    MatchDriver "amdgpu"
    Driver      "amdgpu"
    Option      "DRI"       "3"
    Option      "TearFree"  "1"
EndSection

• 2022/03/02: This caused random diagonal tearing on Fedora 35 with GNOME
• No known benefits over modesetting

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

• For Optimus laptops

sudo zypper install -y xf86-video-intel xf86-video-nouveau

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

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

• Expects pre-SI GPUs ²⁾
• For SI, CIK, and newer GPUs, use amdgpu, along with enabling si_support and cik_support respectively for the amdgpu kernel module ³⁾
• Using the radeon DDX driver caused StepMania to crash with any fullscreen mode on openSUSE TW
• This caused a blinking black screen and GDM unable to start on Ubuntu 20.04.1
• Overall, probably shouldn't use the radeon DDX driver

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

• Coolbits at 28 unlocks all available overclocking settings

sudo cp -p '/usr/share/X11/xorg.conf.d/nvidia.conf' '/etc/X11/xorg.conf.d/nvidia.conf' && sudo -e '/etc/X11/xorg.conf.d/nvidia.conf'

        Option "Coolbits" "28"