@Mohegan I didn't modify anything at /usr/share/X11/xorg.conf.d/
Here you can see all the content there using grep . *:

10-evdev.conf:#
10-evdev.conf:# Catch-all evdev loader for udev-based systems
10-evdev.conf:# We don't simply match on any device since that also adds accelerometers
10-evdev.conf:# and other devices that we don't really want to use. The list below
10-evdev.conf:# matches everything but joysticks.
10-evdev.conf:Section "InputClass"
10-evdev.conf:        Identifier "evdev pointer catchall"
10-evdev.conf:        MatchIsPointer "on"
10-evdev.conf:        MatchDevicePath "/dev/input/event*"
10-evdev.conf:        Driver "evdev"
10-evdev.conf:EndSection
10-evdev.conf:Section "InputClass"
10-evdev.conf:        Identifier "evdev keyboard catchall"
10-evdev.conf:        MatchIsKeyboard "on"
10-evdev.conf:        MatchDevicePath "/dev/input/event*"
10-evdev.conf:        Driver "evdev"
10-evdev.conf:EndSection
10-evdev.conf:Section "InputClass"
10-evdev.conf:        Identifier "evdev touchpad catchall"
10-evdev.conf:        MatchIsTouchpad "on"
10-evdev.conf:        MatchDevicePath "/dev/input/event*"
10-evdev.conf:        Driver "evdev"
10-evdev.conf:EndSection
10-evdev.conf:Section "InputClass"
10-evdev.conf:        Identifier "evdev tablet catchall"
10-evdev.conf:        MatchIsTablet "on"
10-evdev.conf:        MatchDevicePath "/dev/input/event*"
10-evdev.conf:        Driver "evdev"
10-evdev.conf:EndSection
10-evdev.conf:Section "InputClass"
10-evdev.conf:        Identifier "evdev touchscreen catchall"
10-evdev.conf:        MatchIsTouchscreen "on"
10-evdev.conf:        MatchDevicePath "/dev/input/event*"
10-evdev.conf:        Driver "evdev"
10-evdev.conf:EndSection
11-evdev-quirks.conf:Section "InputClass"
11-evdev-quirks.conf:	Identifier "Avago Technologies mouse quirks (LP: #746639)"
11-evdev-quirks.conf:	MatchIsPointer "on"
11-evdev-quirks.conf:	MatchDevicePath "/dev/input/event*"
11-evdev-quirks.conf:	Driver "evdev"
11-evdev-quirks.conf:	MatchUSBID "192f:0416"
11-evdev-quirks.conf:	Option "Emulate3Buttons" "True"
11-evdev-quirks.conf:	Option "Emulate3Timeout" "50"
11-evdev-quirks.conf:EndSection
50-synaptics.conf:Section "InputClass"
50-synaptics.conf:        Identifier "touchpad catchall"
50-synaptics.conf:        Driver "synaptics"
50-synaptics.conf:        MatchIsTouchpad "on"
50-synaptics.conf:        MatchDevicePath "/dev/input/event*"
50-synaptics.conf:        Option "HorizScrollDelta" "0"
50-synaptics.conf:EndSection
50-vmmouse.conf:Section "InputClass"
50-vmmouse.conf:	Identifier	"vmmouse"
50-vmmouse.conf:	MatchIsPointer	"on"
50-vmmouse.conf:	MatchTag	"vmmouse"
50-vmmouse.conf:	Driver		"vmmouse"
50-vmmouse.conf:EndSection
50-wacom.conf:Section "InputClass"
50-wacom.conf:	Identifier "Wacom class"
50-wacom.conf:# WALTOP needs a patched kernel driver, that isn't in mainline lk yet,
50-wacom.conf:# so for now just let it fall through and be picked up by evdev instead.
50-wacom.conf:#	MatchProduct "Wacom|WALTOP|WACOM"
50-wacom.conf:	MatchProduct "Wacom|WACOM|Hanwang"
50-wacom.conf:	MatchDevicePath "/dev/input/event*"
50-wacom.conf:	Driver "wacom"
50-wacom.conf:EndSection
50-wacom.conf:Section "InputClass"
50-wacom.conf:	Identifier "Wacom serial class"
50-wacom.conf:	MatchProduct "Serial Wacom Tablet"
50-wacom.conf:	Driver "wacom"
50-wacom.conf:EndSection
50-wacom.conf:Section "InputClass"
50-wacom.conf:        Identifier "Wacom serial class identifiers"
50-wacom.conf:        MatchProduct "WACf|FUJ02e5|FUJ02e7"
50-wacom.conf:        Driver "wacom"
50-wacom.conf:EndSection
50-wacom.conf:# N-Trig Duosense Electromagnetic Digitizer
50-wacom.conf:Section "InputClass"
50-wacom.conf:	Identifier "Wacom N-Trig class"
50-wacom.conf:	MatchProduct "HID 1b96:0001|N-Trig Pen"
50-wacom.conf:	MatchDevicePath "/dev/input/event*"
50-wacom.conf:	Driver "wacom"
50-wacom.conf:	Option "Button2" "3"
50-wacom.conf:EndSection
51-synaptics-quirks.conf:Section "InputClass"
51-synaptics-quirks.conf:	Identifier "Dell Inspiron embedded buttons quirks"
51-synaptics-quirks.conf:	MatchTag "inspiron_1011|inspiron_1012"
51-synaptics-quirks.conf:	MatchDevicePath "/dev/input/event*"
51-synaptics-quirks.conf:	Driver "synaptics"
51-synaptics-quirks.conf:	Option "JumpyCursorThreshold" "90"
51-synaptics-quirks.conf:	Option "AreaBottomEdge" "4100"
51-synaptics-quirks.conf:EndSection
51-synaptics-quirks.conf:Section "InputClass"
51-synaptics-quirks.conf:	Identifier "Dell Inspiron quirks"
51-synaptics-quirks.conf:	MatchTag "inspiron_1120"
51-synaptics-quirks.conf:	MatchDevicePath "/dev/input/event*"
51-synaptics-quirks.conf:	Driver "synaptics"
51-synaptics-quirks.conf:	Option "JumpyCursorThreshold" "250"
51-synaptics-quirks.conf:EndSection
51-synaptics-quirks.conf:Section "InputClass"
51-synaptics-quirks.conf:	Identifier "HP Mininote quirks"
51-synaptics-quirks.conf:	MatchTag "mininote_1000"
51-synaptics-quirks.conf:	MatchDevicePath "/dev/input/event*"
51-synaptics-quirks.conf:	Driver "synaptics"
51-synaptics-quirks.conf:	Option "JumpyCursorThreshold" "20"
51-synaptics-quirks.conf:EndSection

I've never been able to drag and drop.