Well, as the title explains that's my problem, I'm using 3.18 kernel, and this are my thoughts:
First of all the touchpad wasn't showing up in xinput while I was expecting something like:
⎜ ↳ PS/2 Synaptics TouchPad id=14 [slave pointer (2)]
⎜ ↳ DLL068B:00 06CB:76E9 UNKNOWN id=12 [slave pointer (2)]
the result was:
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ SI id=11 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Power Button id=9 [slave keyboard (3)]
↳ SI id=10 [slave keyboard (3)]
↳ Integrated_Webcam_FHD id=12 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
↳ Dell WMI hotkeys id=14 [slave keyboard (3)]
I have a USB-mouse connected to the computer so it must be the SI.
I was amazed because I have read this question asking for changing the behaviour of the touchpad while mine isn't even detected so I went to the dmesg, that shows:
[ 11.910114] hid-rmi 0018:06CB:76E9.0004: Scanning PDT...
[ 11.918335] hid-rmi 0018:06CB:76E9.0004: Found F34 on page 0x00
[ 11.922470] hid-rmi 0018:06CB:76E9.0004: Found F01 on page 0x00
[ 11.925806] hid-rmi 0018:06CB:76E9.0004: Found F12 on page 0x00
[ 11.938596] hid-rmi 0018:06CB:76E9.0004: Found F54 on page 0x01
[ 11.946371] hid-rmi 0018:06CB:76E9.0004: Found F30 on page 0x02
[ 11.960820] hid-rmi 0018:06CB:76E9.0004: Found F55 on page 0x03
[ 11.968612] hid-rmi 0018:06CB:76E9.0004: rmi_scan_pdt: Done with PDT scan.
[ 11.968678] hid-rmi 0018:06CB:76E9.0004: No 2D sensor found, giving up.
[ 11.968739] hid-rmi 0018:06CB:76E9.0004: Error while initializing F11 (-19).
[ 11.968839] input: DLL068B:00 06CB:76E9 as /devices/pci0000:00/INT3433:00/i2c-0/i2c-DLL068B:00/0018:06CB:76E9.0004/input/input7
[ 11.969042] hid-rmi 0018:06CB:76E9.0004: input,hidraw3: <UNKNOWN> HID v1.00 Mouse [DLL068B:00 06CB:76E9] on
[ 11.969125] hid-rmi 0018:06CB:76E9.0004: Device failed to be properly configured
And the /var/log/Xorg.0.log file shows something like:
[ 26.245] (II) config/udev: Adding input device DLL068B:00 06CB:76E9 (/dev/input/event7)
[ 26.245] (II) No input driver specified, ignoring this device.
So the thing it's it can be a problem with either hid-rmi or a problem with the X configuration (probably the hid-rmi but not for sure) or both which is fun. If anybody have any idea about the problem, it'll be welcomed.
Best regards, me.