Comment 10 for bug 1865962

This regression was introduced by stable update. That means all 5.3/5.4 kernels are affected(including all linux distributions that comes with 5.3/5.4 kernel).

There are 2 ways to fix this issue
1. Find the bad commit in stable update and revert it
2. Find the fixed commit from v5.6 and backport it

I was using the second method to fix this issue for v5.4 and not knowing this happens on v5.3, too.
Backport those commits to v5.4 is fine, since v5.4 is not released yet and can accept big wifi changes. But those commits doesn't fit SRU rules, so that's why v5.3 doesn't get fixed.(Upstream should come out a stable update to fix this issue, since this impacts all distributions)

v5.4 kernel is stable enough, please consider to upgrade to v5.4 if possible. Or stay at 18.04(v4.15) with backport-iwlwifi-dkms package.