My Lenovo ideapad 700-15ISK repeatedly outputs the character '^@' about twice per second while in a tty. This interferes with the functionality of the keyboard (the "repeat keys" feature is quickly interrupted and stopped). Though the '^@' does not print in Unity, the effects are the same. I can login to Unity fine, but typing passwords is impossible in a tty.
Additionally, enabled Synaptics touchpad features simply don't work, including two-finger scrolling and tap to click.
This problem began after upgrading to the first 4.13 kernel. Reverting to kernel 4.11 fixes these issues, and so does installing the mainline kernel (v4.16-rc7).
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-37-generic 4.13.0-37.42~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-37.42~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-37-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Mar 30 00:20:53 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-08-21 (221 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1760013
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.