Kubuntu/Lubuntu系统下HP ENVY DV6触摸板异常：指针无法移动、仅出现混乱滚动的问题求助

Hey there, sorry to hear your touchpad's acting up—it's super frustrating when your main input device goes wonky, especially when you spend a lot of time on your laptop. Let's walk through some troubleshooting steps that might fix this weird behavior on your HP ENVY DV6 running Lubuntu:

• Reload the touchpad kernel module
  Sometimes the touchpad driver module can glitch out after running for a while. Let's try refreshing it. Open a terminal and run these commands one by one:

  sudo rmmod psmouse
  sudo modprobe psmouse
  

  This unloads and reloads the basic mouse/touchpad module. If this fixes the issue temporarily, we can look into making this a permanent fix later, but let's first confirm if it works.

• Check and adjust touchpad settings via xinput
  Let's verify the touchpad is recognized properly and tweak some settings that might be causing interference. First, list all input devices to find your touchpad's name and ID:

  xinput list
  

  Look for an entry like "SynPS/2 Synaptics TouchPad" (note the number in parentheses next to it—this is the device ID). Then, try disabling palm detection, which can sometimes block pointer movement accidentally:

  xinput set-prop <your-touchpad-ID> "libinput Palm Detection Enabled" 0
  

  If that doesn't help, reset all touchpad properties to default with:

  xinput reset-prop <your-touchpad-ID>
  

• Update your system and kernel
  Outdated kernels or packages often cause hardware compatibility glitches. Let's make sure everything is up to date:

  sudo apt update && sudo apt upgrade -y
  

  After updating, restart your laptop. If the issue still happens, you can try installing a newer kernel via Lubuntu's Update Manager (go to "View" > "Linux Kernels" to see available updates).

• Switch between touchpad drivers
  Lubuntu uses libinput by default, but sometimes switching back to the older Synaptics driver fixes compatibility issues. Let's install Synaptics and disable libinput temporarily:

  sudo apt install xserver-xorg-input-synaptics
  sudo apt remove xserver-xorg-input-libinput
  

  Reboot your laptop after this change. If the touchpad works normally now, you can stick with Synaptics. If not, you can switch back by reinstalling libinput and removing Synaptics.

• Disable touchpad power saving
  The system's power management might be putting the touchpad into a faulty low-power state. Let's create a rule to prevent this. Open a text editor with root privileges:

  sudo nano /etc/udev/rules.d/99-touchpad-no-powersave.rules
  

  Paste this line into the file:

  SUBSYSTEM=="input", ATTRS{name}=="SynPS/2 Synaptics TouchPad", RUN+="/bin/sh -c 'echo 0 > /sys/module/psmouse/parameters/power_saving'"
  

  Save the file (press Ctrl+O, then Enter) and exit (Ctrl+X). Reboot your laptop for the changes to take effect.

If none of these steps work, you can check the system logs for error messages that might give us more clues. Run these commands to see touchpad-related logs:

dmesg | grep -i touchpad
journalctl -b | grep -i touchpad

备注：内容来源于stack exchange，提问作者stargazer45