touchpad not detected acer A317-33

Try Fn+F7 on the keyboard. Does this help?

I tried it but it doesn't work. My touchpad doesn't appear in Parameters -> Mouse and Touchpad.
Bu it works on windows 10 ( dual boot) and it's a Synaptics.

Is there anything shown for the trackpad in the output of the commands

lsusb
sudo lspci
dmesg | grep synapt
dmesg | grep pad

If you boot to Windows and shut down the OS. Then power back on into Ubuntu is it OK then? Windows can "hold" hardware sometimes.

@m-hampl nothing for the touchpad for the 2 first commands and nothing at all for the 2 last ones.

@actionparsnip i tried but it didn't work

Is there any unidentified device shown with lsusb or lspci?

I think nothing comes from the touchpad :

~$ lsusb
Bus 002 Device 002: ID 0930:6545 Toshiba Corp. Kingston DataTraveler 102/2.0 / HEMA Flash Drive 2 GB / PNY Attache 4GB Stick
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 04ca:3015 Lite-On Technology Corp.
Bus 001 Device 003: ID 0408:a031 Quanta Computer, Inc. VGA WebCam
Bus 001 Device 002: ID 03f0:2141 HP, Inc HP Wireless Mouse 220
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

~$ sudo lspci
[sudo] Mot de passe de yves :
00:00.0 Host bridge: Intel Corporation Device 4e22
00:02.0 VGA compatible controller: Intel Corporation Device 4e55 (rev 01)
00:14.0 USB controller: Intel Corporation Device 4ded (rev 01)
00:14.2 RAM memory: Intel Corporation Device 4def (rev 01)
00:15.0 Serial bus controller [0c80]: Intel Corporation Device 4de8 (rev 01)
00:15.3 Serial bus controller [0c80]: Intel Corporation Device 4deb (rev 01)
00:16.0 Communication controller: Intel Corporation Device 4de0 (rev 01)
00:17.0 SATA controller: Intel Corporation Device 4dd3 (rev 01)
00:19.0 Serial bus controller [0c80]: Intel Corporation Device 4dc5 (rev 01)
00:19.1 Serial bus controller [0c80]: Intel Corporation Device 4dc6 (rev 01)
00:1a.0 SD Host controller: Intel Corporation Device 4dc4 (rev 01)
00:1c.0 PCI bridge: Intel Corporation Device 4db8 (rev 01)
00:1c.1 PCI bridge: Intel Corporation Device 4db9 (rev 01)
00:1e.0 Communication controller: Intel Corporation Device 4da8 (rev 01)
00:1e.3 Serial bus controller [0c80]: Intel Corporation Device 4dab (rev 01)
00:1f.0 ISA bridge: Intel Corporation Device 4d87 (rev 01)
00:1f.3 Audio device: Intel Corporation Device 4dc8 (rev 01)
00:1f.4 SMBus: Intel Corporation Device 4da3 (rev 01)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Device 4da4 (rev 01)
01:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)

This question was expired because it remained in the 'Open' state without activity for the last 15 days.