I have a keyboard a4tech KV-300h and the bug reproduce on windows too. I have 
already tried to replace to another a new keyboard. The problem isn't gone.
I found out if I use embedded USB port of keyboard to connect a mouse then the 
problem reproduce very often.
Also I tested my keyboard on macbook pro. There is everything works fine. 

System:
  Host: adrug-X470-AORUS-ULTRA-GAMING Kernel: 5.13.0-23-generic x86_64 
  bits: 64 compiler: N/A Desktop: Cinnamon 5.0.7 Distro: Linux Mint 20.2 Uma 
  base: Ubuntu 20.04 focal 
Machine:
  Type: Desktop System: Gigabyte product: X470 AORUS ULTRA GAMING v: N/A 
  serial: N/A 
  Mobo: Gigabyte model: X470 AORUS ULTRA GAMING-CF v: x.x serial: N/A 
  UEFI: American Megatrends LLC. v: F61 date: 07/13/2021 
CPU:
  Topology: 6-Core model: AMD Ryzen 5 3600 bits: 64 type: MT MCP arch: Zen 
  L2 cache: 3072 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 
  bogomips: 86394 
  Speed: 2200 MHz min/max: 2200/3600 MHz Core speeds (MHz): 1: 2200 2: 2189 
  3: 2199 4: 2200 5: 2199 6: 2199 7: 2199 8: 2200 9: 2249 10: 2198 11: 2200 
  12: 2199 
Graphics:
  Device-1: AMD vendor: Gigabyte driver: amdgpu v: kernel bus ID: 0c:00.0 
  Display: server: X.Org 1.20.13 driver: amdgpu,ati 
  unloaded: fbdev,modesetting,radeon,vesa resolution: 2560x1080~60Hz 
  OpenGL: renderer: AMD Radeon RX 6600 XT (DIMGREY_CAVEFISH DRM 3.41.0 
  5.13.0-23-generic LLVM 12.0.1) 
  v: 4.6 Mesa 21.3.0-devel direct render: Yes

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https://bugs.launchpad.net/bugs/124406

Title:
  Keyboard keys get stuck and repeat

Status in GNU Emacs:
  Invalid
Status in Linux:
  Confirmed
Status in X.Org X server:
  In Progress
Status in linux package in Ubuntu:
  Won't Fix
Status in xorg-server package in Ubuntu:
  Won't Fix
Status in linux source package in Jaunty:
  Won't Fix
Status in xorg-server source package in Jaunty:
  Invalid
Status in Gentoo Linux:
  New

Bug description:
  Keyboard keys such as the arrows, Alt-F4, PageUp/PageDown, etc. often
  get 'stuck' and continue being 'clicked' even after they are
  physically released. For example when clicking Alt-F4, sometimes it
  gets stuck so all the windows are closed instead of just one.

  My configuration is Feisty + Xgl + Compiz Fusion. My previous
  configuration was Edgy + Xgl + Beryl, where this didn't happen. Others
  have reported the same problem without using either Xgl or Compiz.

  The keyboard itself isn't the problem. When dual-booting to Windows,
  everything works fine. Also, the problem happens with two different
  keyboards (internal laptop, external USB).

  My best guess is that the problem occurs at time of high system load.
  Somehow during these times the key-release signal gets lost and the
  key-press is repeated indefinitely. This happens more often with
  Compiz configurations because Compiz tends to increase system load. It
  also happens more often with power-hungry apps like Firefox and
  Acrobat Reader for similar reasons.

  PS: When the keys would repeat all input devices would be locked up.
  ie. mouse won't move, clicks don't do anything, keyboard presses don't
  register. Then when it becomes unstuck, the mouse moves around and
  everything. Hope this helps.

  See also this forum thread for other people with the same problem:
  http://ubuntuforums.org/showthread.php?t=432057

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