** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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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:
Fix Released
Status in linux-oem-5.13 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux-oem-5.13 source package in Focal:
Fix Committed
Status in linux-oem-5.14 source package in Focal:
Fix Released
Status in linux source package in Impish:
Fix Committed
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.
SRU justification:
==============
[Impact]
The trackpoint cursor often suddenly jumps to an edge/corner, because
the hardware/firmware sometimes reports wrong coordinates / loses sync.
[Fix]
Ignore the buggy data reported by Elan TP firmware, make the TP usable.
[Test]
Tested on ThinkPad AMD X13 and users confirm on other platforms.
[Where problems could occur]
It's limited to specific Elan device, it may break the Elan Trackpoint.
Jammy already got this commit in Ubuntu-5.15.0-12.12
Phoenix Huang (1):
Input: elantench - fix misreporting trackpoint coordinates
drivers/input/mouse/elantech.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
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