** Description changed: *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(+)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1936295/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
