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truonga

Member

Registered: 2026-03-30

Posts: 5

Synaptic doesnt work after replacement

Hello everyone,

Context: So i have a Thinkpad T14s Gen 1 and I had an Elan touchpad before and I replaced it with a Synaptic Touchpad, I didn't touch the touchpoint, it is still a Elan touchpoint that come by default with the laptop.

Problem: The touchpad and touchpoint seem to work normally but sometimes after I shutdown and reboot my laptop, both the touchpad and the touchpoint stop working, and sometimes later after shutdown/reboot my laptop, both start to work again. I realize that it happens really often when I have my external mouse plugged in.

I try to debug a little bit but I have no clue till now. Libinput gives me:

$ libinput list-devices | grep -i -A 1 touch
Device:                  SynPS/2 Synaptics TouchPad
Kernel:                  /dev/input/event16

$ libinput debug-events /dev/input/event16
-event16  DEVICE_ADDED                 SynPS/2 Synaptics TouchPad        seat0 default group1  cap:pg  size 96x60mm tap (dl off) left scroll-nat scroll-2fg-edge click-buttonareas-clickfinger dwt-on dwtp-on

Dmesg gives me:

$ sudo dmesg | grep -iE 'i2c|elan|psmouse'
[    7.162473] i2c_dev: i2c /dev entries driver
[    8.626836] piix4_smbus 0000:00:14.0: SMBus Host Controller at 0xb00, revision 0
[    8.626844] piix4_smbus 0000:00:14.0: Using register 0x02 for SMBus port selection
[    8.640092] piix4_smbus 0000:00:14.0: Auxiliary SMBus Host Controller at 0xb20
[    9.570232] psmouse serio1: synaptics: queried max coordinates: x [..5678], y [..4720]
[    9.610152] psmouse serio1: synaptics: queried min coordinates: x [1264..], y [1132..]
[    9.610178] psmouse serio1: synaptics: Your touchpad (PNP: LEN2143 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.
[    9.690288] psmouse serio1: synaptics: Touchpad model: 1, fw: 8.16, id: 0x1e2b1, caps: 0xf00ba3/0x940300/0x12e800/0x400000, board id: 3293, fw id: 2697003
[    9.690302] psmouse serio1: synaptics: serio: Synaptics pass-through port at isa0060/serio1/input0
[   10.271852] psmouse serio2: trackpoint: Elan TrackPoint firmware: 0x11, buttons: 3/3
[   10.527247] input: TPPS/2 Elan TrackPoint as /devices/platform/i8042/serio1/serio2/input/input18

Appreciate any help!

Last edited by truonga (2026-08-31 08:34:59)

dimich

Member

From: Kharkiv, Ukraine

Registered: 2009-11-03

Posts: 787

Re: Synaptic doesnt work after replacement

Is there difference in dmesg output when touchpad is working and when it isn't?

psmouse serio1: synaptics: Your touchpad (PNP: LEN2143 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

Did you try to set psmouse.synaptics_intertouch=1 in kernel command line?

sometimes after I shutdown and reboot my laptop, both the touchpad and the touchpoint stop working
it happens really often when I have my external mouse plugged in.

"Sometimes" indicates a possible hardware issue, like power supply interference.

truonga

Member

Registered: 2026-03-30

Posts: 5

Re: Synaptic doesnt work after replacement

Sorry for the late reply.

When the trackpad is working, libinput and dmesg gives me the same thing.

I tried setting psmouse.synaptics_intertouch to 1 but it doesn't do anything