Ubuntu 19.10 here. UI, including mouse, freezes on copying big files within the 
same SSD, but not with HDD.
The suggested change of

  vm.dirty_background_ratio = 5
  vm.dirty_ratio = 10

doesn't help.

Samsung SSD 850 EVO 250GB (EMT02B6Q), SATA, not hotplug.

SMART overall-health self-assessment test result: PASSED

ATA Version is:   ACS-2, ATA8-ACS T13/1699-D revision 4c
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)

The drive has two ext4 partitions: for the system root and for media
files.

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https://bugs.launchpad.net/bugs/1208993

Title:
  Ubuntu slows down and hangs while copying file from/to USB

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