I just bought (in August 2020) a used Thinkpad T440P and installed Ubuntu. I'm going to try and record any solutions to problems/general improvements here.
When scrolling there would be little lines of lag across the screen. This was especially noticeable when I was scrolling through text in Firefox. I followed the instructions here which solved the issue: https://askubuntu.com/a/1111020
In case that link stops working, in summary, I created the file /etc/modprobe.d/zz-nvidia-modeset.conf and added options nvidia_drm modeset=1, then ran sudo update-initramfs -u and rebooted.
One of my biggest issues with libinput is the lack of kinetic scrolling. It seems it can be supported by individual applications, though, and can be enabled in firefox by using the MOZ_USE_XINPUT2=1 env variable.
You can configure scroll speed in about:config by changing the mousewheel.default.delta_multiplier_ variables. Make sure apz.gtk.kinetic_scroll.enabled is true.
The trackpoint was moving my cursor around while I was typing. I disabled the trackpoint completely with the command:
xinput set-prop "TPPS/2 IBM TrackPoint" "Device Enabled" 0PgUp and PgDn (Page Up and Page Down) keysThis is mostly my fault, but I kept accidentally hitting PgUp and PgDn when I meant to hit one of the arrow keys. To disable this, I first had to find the keycodes. I ran xev and clicked the keys, and it displayed the relevant keycodes. It indicated the keycodes as 112 and 117. To double check, I ran xmodmap -pke and was told that those keys corresponded with Prior and Next, which checks out. This is what that output looked like:
...
keycode 109 = Linefeed NoSymbol Linefeed
keycode 110 = Home NoSymbol Home
keycode 111 = Up NoSymbol Up
keycode 112 = Prior NoSymbol Prior
keycode 113 = Left NoSymbol Left
keycode 114 = Right NoSymbol Right
keycode 115 = End NoSymbol End
keycode 116 = Down NoSymbol Down
keycode 117 = Next NoSymbol Next
keycode 118 = Insert NoSymbol Insert
keycode 119 = Delete NoSymbol Delete
...I disabled the keys (temporarily) by running:
xmodmap -e 'keycode 112 = 0x0000'
xmodmap -e 'keycode 117 = 0x0000'To make the change permanent, I followed these steps: https://unix.stackexchange.com/a/520756. So, I ran sudo touch /usr/lib/systemd/system-sleep/xkeyboard; sudo chmod 755 /usr/lib/systemd/system-sleep/xkeyboard then copied the following into the file:
#!/bin/bash
case $1 in
pre)
exit 0
;;
post)
export DISPLAY=:0
sleep 10
xmodmap -e 'keycode 112 = 0x0000'
xmodmap -e 'keycode 117 = 0x0000'
;;
esacAt first (with libinput): The touchpad just didn't work that well. It wouldn't right click when I physically pressed the touchpad with two fingers and scrolling was a little janky. It would also right click sometimes when I was trying to select text (and therefore was clicking with two fingers on the touchpad).
Tried synaptics: I followed the instructions in this answer, and it helped in some respects (scrolling is much better) but it also made some things worse (the cursors jumps around when I remove one finger after having clicked with two): https://askubuntu.com/a/1035863 Update: upon further use, it's pretty bad. Scrolling is good, but a lot of things are pretty bad. One thing I didn't realize I needed until it was gone was thumb rejection (I rest my thump on the trackpad to click while tracking with my index finger).
Trying mtrack: I'm going to try following the instructions here: https://howchoo.com/g/mdy0ngziogm/the-perfect-almost-touchpad-settings-on-linux-2
WARNING: This resulted in my track pad no longer working. I had to open terminal using ctrl-shift-T, removed the conf file, then restarted with these instructions: https://askubuntu.com/a/997223
Steps:
sudo apt install pkg-config make xutils-dev libtool xserver-xorg-dev libx11-dev libxi-dev libxrandr-dev libxinerama-dev libudev-devsudo apt-get install libmtdev./configure after installing any dependencies before running make!