See https://forum.xfce.org/viewtopic.php?id=13926
and upstream issue https://gitlab.xfce.org/xfce/xfce4-settings/-/issues/168

There is a partial fix which apparently fixes the desktop shortcuts being 
locked, but not the multiple calls to xmodmap: 
https://gitlab.xfce.org/atomsymbol/libxfce4ui/-/commit/85d8d390f9f2265613da4291992523937a7a2519
  
  
  XFCE desktop shortcuts are unusable for about 30-40 seconds
  after switching from tty to Xorg if there exists a .Xmodmap
  file in $HOME. Without a .Xmodmap file, the delay is about 10
  seconds. Similar behavior gets triggered when a keyboard is
  reconnected to an USB port. With this patch, desktop shortcuts
  are usable immediately (likely in less than 0.25 seconds after
  switching from tty to Xorg).
  
  An issue not fixed by this patch is that /usr/bin/xmodmap
  can be executed about 30 times after switching to Xorg.
  However, on the tested machine with a relatively small .Xmodmap
  this does not pose a performance issue which would be noticeable
  by the user.


** Bug watch added: gitlab.xfce.org/xfce/xfce4-settings/-/issues #168
   https://gitlab.xfce.org/xfce/xfce4-settings/-/issues/168

** Also affects: linux via
   https://gitlab.xfce.org/xfce/xfce4-settings/-/issues/168
   Importance: Unknown
       Status: Unknown

** Project changed: linux => xfce4-settings

** Package changed: linux (Ubuntu) => xfce4-settings (Ubuntu)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/998310

Title:
  .Xmodmap file makes xorg temporarily reach high cpu usage (90%-100%)
  after resume or when coming back from tty to X session

Status in Xfce4 Settings:
  Unknown
Status in xfce4-settings package in Ubuntu:
  Incomplete

Bug description:
  Each time when I resume my laptop, my computer nearly freezes for
  about 5 minutes and Xorg is using 90-100% cpu. This issue disappears
  and then everything is back to normal.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  Date: Fri May 11 22:57:03 2012
  EcryptfsInUse: Yes
  InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
  ProcEnviron:
   LANGUAGE=ca_ES
   TERM=xterm
   LANG=ca_ES.UTF-8
   SHELL=/bin/bash
  SourcePackage: xorg
  UpgradeStatus: Upgraded to precise on 2012-03-25 (47 days ago)

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