Touchpad multitouch works on 4.15-rc8 kernel but need blacklist hid-generic.

$xinput list

⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad              	id=14	[slave  pointer  (2)]
⎜   ↳ Logitech USB Receiver                   	id=12	[slave  pointer  (2)]
⎜   ↳ Asus TouchPad                           	id=18	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ Power Button                            	id=6	[slave  keyboard (3)]
    ↳ Video Bus                               	id=7	[slave  keyboard (3)]
    ↳ Video Bus                               	id=8	[slave  keyboard (3)]
    ↳ Power Button                            	id=9	[slave  keyboard (3)]
    ↳ Sleep Button                            	id=10	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=13	[slave  keyboard (3)]
    ↳ Logitech USB Receiver                   	id=11	[slave  keyboard (3)]
    ↳ ASUS T300CHI DOCKING                    	id=15	[slave  keyboard (3)]
    ↳ ASUS T300CHI DOCKING                    	id=16	[slave  keyboard (3)]
    ↳ ASUS T300CHI DOCKING                    	id=17	[slave  keyboard (3)]



$xinput list-props 18:

Device 'Asus TouchPad':
	Device Enabled (143):	1
	Coordinate Transformation Matrix (145):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	Device Accel Profile (274):	1
	Device Accel Constant Deceleration (275):	2.500000
	Device Accel Adaptive Deceleration (276):	1.000000
	Device Accel Velocity Scaling (277):	12.500000
	Synaptics Edges (298):	105, 2535, 71, 1249
	Synaptics Finger (299):	25, 30, 0
	Synaptics Tap Time (300):	180
	Synaptics Tap Move (301):	129
	Synaptics Tap Durations (302):	180, 100, 100
	Synaptics ClickPad (303):	1
	Synaptics Middle Button Timeout (304):	0
	Synaptics Two-Finger Pressure (305):	282
	Synaptics Two-Finger Width (306):	7
	Synaptics Scrolling Distance (307):	59, 59
	Synaptics Edge Scrolling (308):	0, 0, 0
	Synaptics Two-Finger Scrolling (309):	1, 1
	Synaptics Move Speed (310):	1.000000, 1.750000, 0.067774, 0.000000
	Synaptics Off (311):	0
	Synaptics Locked Drags (312):	0
	Synaptics Locked Drags Timeout (313):	5000
	Synaptics Tap Action (314):	2, 3, 0, 0, 3, 1, 0
	Synaptics Click Action (315):	1, 3, 0
	Synaptics Circular Scrolling (316):	0
	Synaptics Circular Scrolling Distance (317):	0.100000
	Synaptics Circular Scrolling Trigger (318):	0
	Synaptics Circular Pad (319):	0
	Synaptics Palm Detection (320):	0
	Synaptics Palm Dimensions (321):	10, 200
	Synaptics Coasting Speed (322):	20.000000, 50.000000
	Synaptics Pressure Motion (323):	30, 160
	Synaptics Pressure Motion Factor (324):	1.000000, 1.000000
	Synaptics Resolution Detect (325):	1
	Synaptics Grab Event Device (326):	0
	Synaptics Gestures (327):	1
	Synaptics Capabilities (328):	1, 0, 0, 1, 1, 0, 0
	Synaptics Pad Resolution (329):	29, 31
	Synaptics Area (330):	0, 0, 0, 0
	Synaptics Soft Button Areas (618):	1320, 0, 1082, 0, 0, 0, 0, 0
	Synaptics Noise Cancellation (331):	14, 14
	Device Product ID (261):	2821, 34050
	Device Node (262):	"/dev/input/event14"