Comment 3 for bug 1773973

Did this issue start with the 4.15.0-22 kernel? Was there a prior 4.15 based kernel that did not exhibit this bug?

Could you also see if this bug happens with the Bionic -proposed or mainline kernel:

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed.

Mainline can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17-rc7/