I emailed Matthias R and asked him to take a look at this bug report.
According to his reply in comment #20 above, the fix was successfully
applied to kernel 5.10 but should not have been backported since the
problem did not exist in kernels < 5.10.  A user on the MythTV forum is
successfully using kernel 5.10 with an IR remote with no issue.  The
problem in focal affecting many people occurred due to LP #1918516 as
referenced in Kernel SRU Workflow 1921052 (https://bugs.launchpad.net
/kernel-sru-workflow/+bug/1921052).  Thanks for anything that can be
done to fix this.

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https://bugs.launchpad.net/bugs/1926030

Title:
  IR Remote Keys Repeat Many Times Starting with Kernel 5.8.0-49

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I use an IR remote with the ir-keytable package.  Everything was
  working fine until kernel 5.8.0-49 was automatically installed by
  Software Updater on Ubuntu 20.04.2.  When any key is pressed on the
  remote, the key is repeated about 500 times.  The kernel is now
  5.8.0-50, and the problem persists.

  Other users on the MythTV mailing list are reporting the issue, and it
  appears that the problem is related to changes in the following files:

  drivers/media/rc/ir-mce_kbd-decoder.c
  drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
  drivers/media/rc/serial_ir.c

  It has been reported that reverting the ir-mce_kbd-decoder.c and rc-
  main.c files to the older versions fixes the problem.

  /proc/version_signature > version.log:
  Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18

  lspci -vnvn:
  00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v6/7th Gen Core 
Processor Host Bridge/DRAM Registers [8086:590f] (rev 06)
        Subsystem: ASUSTeK Computer Inc. Xeon E3-1200 v6/7th Gen Core Processor 
Host Bridge/DRAM Registers [1043:8694]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort+ >SERR- <PERR- INTx-
        Latency: 0
        Capabilities: [e0] Vendor Specific Information: Len=10 <?>
        Kernel driver in use: skl_uncore

  ir-keytable -V:
  IR keytable control version 1.18.0

  lsb_release -rd:
  Description:  Ubuntu 20.04.2 LTS
  Release:      20.04
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ted        1020 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-09-19 (217 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  IwConfig:
   lo        no wireless extensions.
   
   enp3s0    no wireless extensions.
   
   enp0s31f6  no wireless extensions.
  MachineType: System manufacturer System Product Name
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-50-generic 
root=UUID=529cae8e-19cd-4732-80d5-b3dca123afc6 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-50-generic N/A
   linux-backports-modules-5.8.0-50-generic  N/A
   linux-firmware                            1.187.11
  RfKill:
   
  Tags:  focal
  Uname: Linux 5.8.0-50-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd mythtv plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/05/2017
  dmi.bios.release: 5.12
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3405
  dmi.board.asset.tag: Default string
  dmi.board.name: H110T
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3405:bd07/05/2017:br5.12:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH110T:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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