Bug 1425607

I followed the same steps, except I changed the "220" in line libinput:name:SynPS/2 Synaptics TouchPad:dmi:*svnLENOVO:*:pvrThinkPadX220* to 240.

This made the jitter go away, however now the touchpad is much too slow. How could I fix that?

hmm, the 240 doesn't have the same touchpad as the 230, so it isn't affected by the firmware the same way, so I can't recommend using that quirk since that one is specific to that hardware. The x240 has the same touchpad as the T440 which I have in front of me here. What exactly is the problem you're seeing?

Created attachment 1256320 [details]
evtest

When I move my finger on the touchpad very slowly, the cursor will stop moving, and then it will eventually jump to another position.

Makes it very hard to click small things such as the x's on internet browser tabs.

I will try to record a video/gif of it happening if that will help.

Created attachment 1256327 [details]
GIF of mouse movement. Jumps when dragging slowly.

did you update the firmware at some point? I'm surprised it does that, the 40 series was pretty good but the 50 series has that problem. Either way, I'm currently working on tweaking the pointer acceleration again which makes this problem go away to some degree

I might have automatically done it on Windows through lenovo's updater app. And awesome! Sounds great. I noticed it doesn't do it on the xf86-input-synaptics driver.

synaptics has slower acceleration, so you move your finger faster to get the same pointer movement. That papers over the bug (if it's the same as seen on the *50 series). See https://who-t.blogspot.com.au/2016/09/libinput-and-lenovo-t450-and-t460.html

Please try the scratch build in bug 1415793, thanks

Wow, that's much better. I can now much more accurately hit the small 'x' on chrome tabs now.

The cursor seems to jitter when moving diagonally. It also still jumps but the jumps are much smaller and seem to only happen at the slowest of dragging speeds.

But these issues are very minimal compared to how imprecise it was before I updated. Thanks!

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