Comment 23 for bug 1865170

There are a few s2idle fixes and workaround in mainline kernel, and it may worth a try. If it can fix your problem, fixes can be backported to bionic

latest mainline kernel: https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.6-rc4/

instructions: https://askubuntu.com/questions/879888/how-do-i-update-kernel-to-the-latest-mainline-version