Ubuntu 18.04 touchpad not fully working after wake from suspend

Question

When the laptop (Dell Vostro 15) wakes from suspend the mouse cursor can be moved with the touchpad at the login/lock screen, but once back in to the session does not move it. At this point plugging in an external USB mouse works fine. The touchpad works after a reboot, until suspending.

Solution 1

Reloading the touchpad / mouse driver after resuming from suspend works in most cases.

Run sudo -H gedit /lib/systemd/system-sleep/touchpad

Copy and paste in these lines:

#!/bin/bash

if [[ $1 == post ]]; then
    modprobe -r psmouse
    modprobe psmouse
fi

Save the file and exit.

Now make it a program by setting the execution bit:

chmod a+x /lib/systemd/system-sleep/touchpad

You will need to reboot for changes to take effect.

Solution 2

This issue went away after an update. Not sure of its actual cause.

Comments

[Andrew Ray]

This didn't help (I'd actually tried before manually rmmod and modprobing psmouse). But now, after another restart, it is working again. I believe some update was installed as well, so perhaps some transient kernel issue that was fixed?

[Admin]

This issue went away after an update. Not sure of its actual cause.

[WinEunuuchs2Unix]

I should have put into the answer a reboot may be necessary for changes to take effect but I didn't fully research that part of the answer. Let me know if it is still broken after next suspend. Thanks.

[SaTa]

This solution did not work for me. Ubuntu 18.04 with "SYNA8004:00 06CB:CD8B Touchpad", Lenovo X1 Carbon Gen 7. I get snappy touchpad behavior after resuming from hibernation.

[WinEunuuchs2Unix]

@SaTa You need to reboot for changes to take effect. Also hibernation often brings a host of new problems not found with suspend/resume.

[SaTa]

Thanks. The issue goes away if I do a reboot. Running modprobe -r psmouse and then modprobe psmouse from the terminal should resolve the problem, right? It doesn't though. If it was solving the issue, then I could have within the script you are recommending.

[Antony]

instead of psmouse, I actually had to target i2c_i801 to get the two finger scrolling to work again.

[mirec]

still there in ubuntu 20.04(focal)

[Admin]

still there in ubuntu 20.04(focal)

[Adones Pitogo]

On my lenovo x1 carbon, I had to replace pmouse with i2c_i801 to get the 2 finger scrolling working after suspend.