Linux kernel 5.14 was released and 5.15 merge window should be open soon
followed by rc1. If we don't see the patch lands in mainline we can
consider alternatives such as submit the SRU as a sauce patch instead.

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https://bugs.launchpad.net/bugs/1936295

Title:
  Faulty Elantech Trackpoint firmware unusable as it causes sudden
  cursor jump to an edge/corner on Lenovo Thinkpad X13, T14s, A475 -->
  Apply kernel patch to mitigate the FW bug

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  *Problem description:*
  On Lenovo Thinkpad T14s, X13, A475 (and probably more models) the Elantech 
Trackpoint firmware is defective. The trackpoint cursor often suddenly jumps to 
an edge/corner, because the hardware/firmware sometimes reports wrong 
coordinates / loses sync. Currently, the Trackpoint is barely usable and it's 
impossible to productively work using it.

  For a long while, Elantech has not yet put forward (nor confirmed) a
  firmware update. However, there is a Linux kernel patch mitigating the
  firmware bug. The kernel bugfix discards the wrongly reported packages
  by the Elantech hardware. This solves the problem for the user.

  *Solution:* Please apply existing kernel patch here.
  https://bugzilla.kernel.org/show_bug.cgi?id=209167 Bug entry in the Linux 
Kernel.org Bugzilla
  https://bugzilla.kernel.org/attachment.cgi?id=295733&action=diff Diff of 
bugfix

  
  *T14s and X13 are Ubuntu certified:*
  The Lenovo Thinkpad T14s and X13 are Ubuntu certified, but apparently this 
hardware issue has slipped the Ubuntu certification process! 
https://ubuntu.com/certified/202006-27978 and 
https://ubuntu.com/certified/202006-27979

  *Further information:*
  
https://forums.lenovo.com/t5/Fedora/T14s-AMD-Trackpoint-almost-unusable/m-p/5064952?page=1
 Discussion on the bug in the Lenovo forum. E.g. see comment 18 by Lenovo 
employee MarkRHPearson

  *My System:*
  Lenovo Thinkpad T14s (AMD) 20ujs00k00
  Ubuntu 21.04 and 20.04
  see entries in kernel.org bugzilla for logs.

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