Keys that are held down for more than 1s repeat endlessly

[Tom Cook]

I'm not sure how else to describe this than the title: keys that are held down for more than 1s (as near as I can judge) repeat endlessly. If I strike the 'n' key, I get one 'n'. If I hold it down for over one second, I get a never-ending stream of 'n's, until I press the 'n' key again.

Attached is the output of xev where I have run `xev > xev.log`, held the 'n' key for approx 1.5 seconds, released it, waited approx 10 seconds, stuck the 'n' key quickly and then exited xev.

The problem is not that keyboard events in general go missing; keypress events are never missed and normal typing is fine. It is only when a key is held down.

The defect appears to be in the X server, as the same problem does not happen on a text console.

The system is a Lenovo ThinkPad E560 running Ubuntu 16.04 with the stock kernel.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Sun Sep 4 22:39:30 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Sky Lake Integrated Graphics [8086:1916] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Skylake Integrated Graphics [17aa:5049]
InstallationDate: Installed on 2016-07-23 (43 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 5986:0708 Acer, Inc
 Bus 001 Device 003: ID 8087:0a2b Intel Corp.
 Bus 001 Device 002: ID 17ef:6022 Lenovo
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 20EVCTO1WW
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic.efi.signed root=UUID=87a15932-e388-46bb-bf7c-25de78ada2de ro quiet splash i8042.nomux=1 i8042.reset vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/03/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: R00ET35W (1.10 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20EVCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrR00ET35W(1.10):bd12/03/2015:svnLENOVO:pn20EVCTO1WW:pvrThinkPadE560:rvnLENOVO:rn20EVCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20EVCTO1WW
dmi.product.version: ThinkPad E560
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Sun Sep 4 22:28:58 2016
xserver.configfile: default
xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 1191
 vendor LGD
xserver.version: 2:1.18.3-1ubuntu2.2

[Tom Cook (tom-k-cook)]

Note this only happens with the laptop's built-in keyboard, not a USB keyboard.

[Paul White (paulw2u)]

We are sorry that we do not always have the capacity to review all reported bugs in a timely manner. You reported this bug some time ago and there have been many changes in Ubuntu since that time.

Ubuntu 16.04 (xenial) reached end-of-standard-support on April 29, 2021.

Do you still see a problem related to the one that you reported when using a currently supported version of Ubuntu? Please let us know if you do otherwise this report can be left to expire in approximately 60 days time.

Thank you for helping make Ubuntu better.

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]