I installed the new proposed kernel and tested the trackpoint for some hours. I confirm that the new kernel fixes the bug on Lenovo Thinkpad T14s Gen1 (AMD).
Can someone verify and change the tag 'verification-needed-impish' to 'verification-done-impish'? I don't see where I could change tags in Launchpad. Thank you very much! System: Linux version 5.13.0-24-generic (buildd@lcy02-amd64-019) Ubuntu 21.10 »Impish Indri« -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-5.14 in Ubuntu. 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(+) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1936295/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
