I have also tested the updated kernel from bionic-proposed using the VM in which the original problem was first experienced.
'uname -a' after adding bionic-proposed to /etc/apt/sources.list and doing 'sudo apt update; sudo apt upgrade'
Linux ubuntuvm1 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Like Daniel, the changes incorporated into 4.15.0-55 are working for me as well.
I have also tested the updated kernel from bionic-proposed using the VM in which the original problem was first experienced.
'uname -a' after adding bionic-proposed to /etc/apt/ sources. list and doing 'sudo apt update; sudo apt upgrade'
Linux ubuntuvm1 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Like Daniel, the changes incorporated into 4.15.0-55 are working for me as well.