Hi @briggs_1978: 

the mouse technology is much newer in the 9360 than what is supported in the 16.04 ubuntu build. Moving to the newer mouse driver will alleviate some of the annoyances with the touch pad in Linux. You can upgrade the driver using this dell guide - http://www.dell.com/support/article/hk/en/hkbsd1/sln308258/precision-xps-ubuntu-general-touchpad-mouse-issue-fix?lang=en  

HTH

Thanks for your help.  I checked out the link and I already have libinput running.  I've attached the existing device setting below.  I also looked around in the libinput manpage that was linked and I didn't see anything that would resolve low sensitivity other than " Option "TabletToolPressureCurve" " but the use of the word Tablet gave me hesitation.

PS.  The computer has a touchscreen, but I have it disabled in the BIOS.

Any thoughts?

 xinput list-props 11
Device 'DLL082A:01 06CB:76AF Touchpad':
	Device Enabled (139):	1
	Coordinate Transformation Matrix (141):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	libinput Tapping Enabled (274):	1
	libinput Tapping Enabled Default (275):	0
	libinput Tapping Drag Enabled (276):	1
	libinput Tapping Drag Enabled Default (277):	1
	libinput Tapping Drag Lock Enabled (278):	0
	libinput Tapping Drag Lock Enabled Default (279):	0
	libinput Tapping Button Mapping Enabled (280):	1, 0
	libinput Tapping Button Mapping Default (281):	1, 0
	libinput Natural Scrolling Enabled (282):	1
	libinput Natural Scrolling Enabled Default (283):	0
	libinput Disable While Typing Enabled (284):	1
	libinput Disable While Typing Enabled Default (285):	1
	libinput Scroll Methods Available (286):	1, 1, 0
	libinput Scroll Method Enabled (287):	1, 0, 0
	libinput Scroll Method Enabled Default (288):	1, 0, 0
	libinput Click Methods Available (289):	1, 1
	libinput Click Method Enabled (290):	0, 1
	libinput Click Method Enabled Default (291):	1, 0
	libinput Middle Emulation Enabled (292):	0
	libinput Middle Emulation Enabled Default (293):	0
	libinput Accel Speed (294):	0.000000
	libinput Accel Speed Default (295):	0.000000
	libinput Left Handed Enabled (296):	0
	libinput Left Handed Enabled Default (297):	0
	libinput Send Events Modes Available (259):	1, 1
	libinput Send Events Mode Enabled (260):	0, 0
	libinput Send Events Mode Enabled Default (261):	0, 0
	Device Node (262):	"/dev/input/event17"
	Device Product ID (263):	1739, 30383
	libinput Drag Lock Buttons (298):	
	libinput Horizontal Scroll Enabled (299):	1
 

xinput list-props 10
Device 'Integrated_Webcam_HD: Integrate':
	Device Enabled (139):	1
	Coordinate Transformation Matrix (141):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	libinput Send Events Modes Available (259):	1, 0
	libinput Send Events Mode Enabled (260):	0, 0
	libinput Send Events Mode Enabled Default (261):	0, 0
	Device Node (262):	"/dev/input/event18"
	Device Product ID (263):	3141, 26380

xinput list
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ DLL082A:01 06CB:76AF Touchpad           	id=11	[slave  pointer  (2)]
⎜   ↳ Logitech USB Optical Mouse              	id=17	[slave  pointer  (2)]

@briggs_1978

Barton brought me your case. Please send me a private message including your service tag and we'll start a case together.

Did you find a solution?

I have the exact same issue. Not in windows, not with synaptics, only with libinput.

Around 10% tap fails.

Except you and myself, I can't find anyone with this issue.

This has been going on since last august. I have asked help on countless forums. I just can't figure if there is a hardware problem or not. It's maddening.

If you have the time I'd really like to know what you did.

I wish OP would tell us if he ended up fixing his issue because I'm also having the same problem. Ubuntu 18.04.2 LTS with libinput... Same thing, about 10% taps are unregistered.

Please help us!

I ended up selling that computer because the touchpad was driving me insane.

Unfortunately I just purchased an XPS 15 7590 and I'm having the exact same problem!

No problem under windows, but in Ubuntu and Fedora, it's dropping at least one out of six taps.

Has anyone discovered a fix for this?  Nothing is coming up in searches, except the libinput stuff from three years ago.