Created attachment 134793 [details]
evemu log for scroll (poor sensitivity)

I looked at my dmesg output and saw this.

'psmouse serio1: synaptics: Your touchpad (PNP: DLL05eb PNP0f13) says it can support a different bus. If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this to linux-input@vger.kernel.org.'

When I set the kernel parameter and booted again, the touchpad was behaving with the following issues :

- lower sensitivity
- accidental middle clicks (which paste whatever I previously selected)
- no acceleration

I looked at Xorg log and for both synaptics_intertouch = 0 or 1, libinput driver was used.

Details

$ libinput --version
1.8.3

$ udevadm info /sys/class/input/event7
P: /devices/rmi4-00/input/input74/event7
N: input/event7
E: DEVNAME=/dev/input/event7
E: DEVPATH=/devices/rmi4-00/input/input74/event7
E: ID_BUS=rmi
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=53
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=98
E: LIBINPUT_DEVICE_GROUP=1d/6cb/0/0:rmi4-00
E: MAJOR=13
E: MINOR=71
E: SUBSYSTEM=input
E: USEC_INITIALIZED=1260430386

Vendor : Dell Inspiron 3537

$ cat /sys/class/dmi/id/modalias 
dmi:bvnDellInc.:bvrA09:bd08/25/2016:svnDellInc.:pnInspiron3537:pvrA09:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvrA09:

Physical Dimension of touchpad (the actual area, without including buttons)
Width = 10.8 cm
Height = 6.1 cm

The touchpad has two physical buttons (L, R)