UserAgent: Mozilla/5.0 (X11; CrOS aarch64 9901.77.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.97 Safari/537.36
Platform: 9901.77.0 (Official Build) stable-channel elm

Steps to reproduce the problem:
1. 13 inch Acer Chomebook R13 
2. Switch resolution from 1920x1080 to 1536x864
3. My two new R13 has this behaviour so it is reproducible on this model.

What is the expected behavior?
When down scale the screen to 1536x864,the mouse speed should move at the same speed as at 1920x1080 resolution.

What went wrong?
At 1536x864 resolution the mouse speed gets quicker without change of settings. It seems that when resolution is scale down by 1.25 it does not scale the mouse track pad speed.

Did this work before? N/A 

Chrome version: 62.0.3202.97  Channel: stable
OS Version: 9901.77.0
Flash Version: 

It seems that if you select other available resolution instead of 1536x864 (the other resolution where it is blurry for the end user) the track pad speed scales correctly. 

I remember the fix to the blurry screen for 1.25 scaling (#force-device-scale-factor) might be the reason as it seems to affect 1.25 scale (1536x864) and not any other resolution choices.

I cannot confirm on other chromebooks of the 13inch size.

Not sure if this happened on version before Chome OS 62 as I did not own the Acer R13 at this time.