Bug 103219

Summary: kernel: libinput jittery with psmouse.synaptics_intertouch = 1
Product: Wayland Reporter: quantumphoton007
Component: libinputAssignee: Wayland bug list <wayland-bugs>
Status: RESOLVED NOTOURBUG QA Contact:
Severity: major    
Priority: medium CC: benjamin.tissoires, peter.hutterer, quantumphoton007
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments: evemu log for scroll (poor sensitivity)

Description quantumphoton007 2017-10-11 12:42:41 UTC
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)
Comment 1 Peter Hutterer 2017-12-18 05:03:44 UTC
I'm going to punt this to the kernel, there are a few devices where switching to RMI4 is a bad idea because the cursor gets way too jittery and we get lost syncs etc.

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