Public bug reported:

This wireless adapter worked well under 18.04.4 (kernel 5.3) but has
poor range after installing 20.04 (kernel 5.4).  This is testing a
2.4GHz connection.  While the received signal strength appears to be the
same with either kernel, the transmitted signal is much weaker under the
5.4 kernel (as assessed from the wifi access point running OpenWrt): the
5.4 kernel yields  ~10-20 lower dBm than the 5.3 kernel.  This greatly
reduces the usable wifi range.

To summarize testing:
5.3.0-28-generic (Booting off a 18.04.4 live USB) shows good signal.
5.4.0-39-generic (latest supported on 20.04) is problematic
5.6.0-1011-oem (installed from standard repos) is problematic
mainline kernel 5.8.0-050800-generic shows good signal.

Ideas to further narrow down this regression?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-39-generic 5.4.0-39.43
ProcVersionSignature: Ubuntu 5.4.0-39.43-generic 5.4.41
Uname: Linux 5.4.0-39-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  johnson    745 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 29 23:18:24 2020
InstallationDate: Installed on 2020-05-29 (32 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 05c8:022a Cheng Uei Precision Industry Co., Ltd 
(Foxlink) HP Webcam
 Bus 001 Device 002: ID 0bda:b00b Realtek Semiconductor Corp. Bluetooth Radio 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Stream Laptop 11-ah0XX
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-39-generic 
root=UUID=d161feb8-d49a-4c0c-b954-e14175cdae0b ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-39-generic N/A
 linux-backports-modules-5.4.0-39-generic  N/A
 linux-firmware                            1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/23/2018
dmi.bios.vendor: Insyde
dmi.bios.version: F.02
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 84FC
dmi.board.vendor: HP
dmi.board.version: 06.17
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnInsyde:bvrF.02:bd05/23/2018:svnHP:pnHPStreamLaptop11-ah0XX:pvr:rvnHP:rn84FC:rvr06.17:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Stream
dmi.product.name: HP Stream Laptop 11-ah0XX
dmi.product.sku: 4ND15UA#ABA
dmi.sys.vendor: HP

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1885663

Title:
  RTL8822BE wifi regression

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