Public bug reported:

>From /proc/bus/input/devices:

I: Bus=0018 Vendor=06cb Product=cd97 Version=0100
N: Name="DELL08E1:00 06CB:CD97 Touchpad"
P: Phys=i2c-DELL08E1:00
S: 
Sysfs=/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-9/i2c-DELL08E1:00/0018:06CB:CD97.0002/input/input30
U: Uniq=
H: Handlers=mouse0 event4 
B: PROP=1
B: EV=1b
B: KEY=e520 30000 0 0 0 0
B: ABS=2e0800000000003
B: MSC=20


The touchpad becomes unresponsive when it enters power saving mode 
(/sys/devices/pci0000\:00/0000\:00\:15.1/power/control = auto). The problem is 
fixed when disabling the power saving mode.

The problem happens both with Synaptics and Libinput as driver.

** Affects: xorg-hwe-18.04 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: xserver-xorg-input-libinput-hwe-18.04 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: xserver-xorg-input-synaptics-hwe-18.04 (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: xserver-xorg-input-libinput-hwe-18.04 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: xserver-xorg-input-synaptics-hwe-18.04 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1845893

Title:
  Dell Latitude 7400 Touchpad unresponsive in power saving mode

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