I tested Linux Kernel 5.8 which had the driver out of the box as
rtw_8723de but the firmware bug is not present. The bug also does not
occur when using the drivers from Larry Fingers rtw88 GitHub repository
which comes with the rtw_8723de driver for the module.

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https://bugs.launchpad.net/bugs/1892614

Title:
  RTL8723DE firmware bug: rtw_pci 0000:0d:00.0: failed to send h2c
  command

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  WiFi (WLAN) Module: Realtek RTL8723DE (came with my HP laptop). Ubuntu
  20.04 is the first Ubuntu release to have the module working out of
  the box.

  Network devices as output by 'inxi -N'
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: 
r8169 
  Device-2: Realtek RTL8723DE 802.11b/g/n PCIe Adapter driver: rtw_pci 
  Device-3: Realtek 802.11n WLAN Adapter type: USB driver: btusb 

  The error 'rtw_pci 0000:0d:00.0: failed to send h2c command' is logged
  every time I use the module for internet access. The error is logged
  more frequently especially if I stream a video and other related
  tasks. The driver is stable but it may fail become unavailable unless
  a cold boot is performed. The attached log contains the error logged
  many times when I was streaming a video Today. According to
  https://askubuntu.com/questions/1217892/system-responds-with-failed-
  to-send-h2c-command-on-shutdown-what-does-that-me the error may be due
  to a firmware issue or the driver issue. The error does not occur if
  using the Realtek drivers obtained from Github in this link:
  https://github.com/lwfinger/rtw88 and the driver of the module is
  identified as rtw_8723de.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-42-generic 5.4.0-42.46
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tony       1949 F.... pulseaudio
   /dev/snd/controlC1:  tony       1949 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Aug 23 08:37:12 2020
  InstallationDate: Installed on 2020-08-22 (1 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  MachineType: HP HP Laptop 15-bs1xx
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic 
root=UUID=7b47411f-1984-4025-9678-8f5fba5b2059 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-42-generic N/A
   linux-backports-modules-5.4.0-42-generic  N/A
   linux-firmware                            1.187.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/06/2019
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.65
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 8444
  dmi.board.vendor: HP
  dmi.board.version: 67.33
  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.65:bd12/06/2019:svnHP:pnHPLaptop15-bs1xx:pvrType1ProductConfigId:rvnHP:rn8444:rvr67.33:cvnHP:ct10:cvrChassisVersion:
  dmi.product.family: 103C_5335KV HP Notebook
  dmi.product.name: HP Laptop 15-bs1xx
  dmi.product.sku: 4UL47EA#BH5
  dmi.product.version: Type1ProductConfigId
  dmi.sys.vendor: HP

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