UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10718.13.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.15 Safari/537.36
Platform: 10718.13.0 (Official Build) dev-channel eve

Steps to reproduce the problem:
1. connect UHD screen
2. set screen to 3840 200%
3. mouse pointer is tiny

What is the expected behavior?
Mouse pointer on external screen should be reasonable size

What went wrong?
Mouse pointer is tiny. Microscopic, really. Very hard to find on the screen.

Did this work before? Yes 66

Chrome version: 68.0.3440.15  Channel: dev
OS Version: 10718.13.0
Flash Version: 

Pixelbook internal screen is 234.51 PPI and represents the low end of the "Display size" scale as 50%. External screen is 186.69 PPI (23.6" 3840) and represents the low end of hte "Display size" scale as 100%. For proper scaling, one has to set it to 200%

My suspicion is that the pointer size is locked at 100%, which seems like a reasonable approach except that UHD on a 23.6" display clearly needs to be scaled, so it would make sense to use a scale like the internal display uses. Then presumably the pointer would also be normal size.

Of course, I could be completely wrong about the relationship between pointer size and the display size slider. It just seems to fit the symptoms.

Pointer size was fine on stable. I recently switched to dev for crostini and started seeing this problem when I switched.