Comment 27 for bug 1768292

Followed the instructions in https://wiki.ubuntu.com/Testing/EnableProposed to enable installing from the proposed repository. Used aptitude -t bionic-proposed to upgrade the linux-headers-generic, linux-generic, linux-image-generic, and linux-signed-generic packages. This resulted in the following being installed (per dpkg -l):

ii linux-generic 4.15.0.23.24 amd64 Complete Generic Linux kernel and headers
ii linux-headers-4.15.0-23 4.15.0-23.25 all Header files related to Linux kernel version 4.15.0
ii linux-headers-4.15.0-23-generic 4.15.0-23.25 amd64 Linux kernel headers for version 4.15.0 on 64 bit x86 SMP
ii linux-headers-generic 4.15.0.23.24 amd64 Generic Linux kernel headers
ii linux-image-4.15.0-23-generic 4.15.0-23.25 amd64 Signed kernel image generic
ii linux-image-generic 4.15.0.23.24 amd64 Generic Linux kernel image
ii linux-modules-4.15.0-23-generic 4.15.0-23.25 amd64 Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
ii linux-modules-extra-4.15.0-23-generic 4.15.0-23.25 amd64 Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
ii linux-signed-generic 4.15.0.23.24 amd64 Complete Signed Generic Linux kernel and headers (dummy transitional package)

I shut down my laptop and powered on via battery (issue only arises on battery power). I selected the 4.15.0.23 kernel via GRUB and booted. No issues observed. Tested multiple times without issue. I believe this kernel fixes the issue.