Public bug reported:

I've recently switched from 16.04/Unity to 18.04/Gnome3, with new
hardware (a Lenovo Thinkpad T470s) used mostly with a docking station
and external keyboard.

I do heavily use of in-workspace windows switch (eg, Alt+Esc) and i've found 
that every time i press Alt+Backslash (in Italian keyboard layout Backslash is 
all left, between TAB and Esc keys) my session ''lock up'': i can switch 
between windows, i can use the gnome shell and the top bar (status bar?), i can 
even run other application (via Alt+F2 or gnome shell menu) but every window 
(old or new) are ''locked'', like there's no focus: no keyboard nor mouse 
interaction is possible.
Application are not 'locked', they continue to run, but there's no way to 
interact with them.

I can also lock the screen, or put the system in standby: i can awaken
from that, insert the password but still no focus on windows.

The only solution: logout.

I've also tried to define a keyboard shortcut to map Alt+Backslash,
but... gnome keyboard configurator locks as every other window when i
press the keys.

Please, help me at least to disable that 'killer' keyboard shortcut! ;-)

Thanks.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jul  3 12:16:18 2018
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.shell' b'enabled-extensions' 
b"['system-moni...@paradoxxx.zero.gmail.com', 
'workspace-g...@mathematical.coffee.gmail.com', 'windows-alt-...@tglman.org']"
 b'org.gnome.shell' b'command-history' redacted by apport
 b'org.gnome.shell' b'favorite-apps' redacted by apport
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2018-05-25 (38 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1779846

Title:
  Pressing Alt+Backslash locks up all windows (no focus)

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  I've recently switched from 16.04/Unity to 18.04/Gnome3, with new
  hardware (a Lenovo Thinkpad T470s) used mostly with a docking station
  and external keyboard.

  I do heavily use of in-workspace windows switch (eg, Alt+Esc) and i've found 
that every time i press Alt+Backslash (in Italian keyboard layout Backslash is 
all left, between TAB and Esc keys) my session ''lock up'': i can switch 
between windows, i can use the gnome shell and the top bar (status bar?), i can 
even run other application (via Alt+F2 or gnome shell menu) but every window 
(old or new) are ''locked'', like there's no focus: no keyboard nor mouse 
interaction is possible.
  Application are not 'locked', they continue to run, but there's no way to 
interact with them.

  I can also lock the screen, or put the system in standby: i can awaken
  from that, insert the password but still no focus on windows.

  The only solution: logout.

  I've also tried to define a keyboard shortcut to map Alt+Backslash,
  but... gnome keyboard configurator locks as every other window when i
  press the keys.

  Please, help me at least to disable that 'killer' keyboard shortcut!
  ;-)

  Thanks.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.1-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
  Uname: Linux 4.15.0-24-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jul  3 12:16:18 2018
  DisplayManager: gdm3
  GsettingsChanges:
   b'org.gnome.shell' b'enabled-extensions' 
b"['system-moni...@paradoxxx.zero.gmail.com', 
'workspace-g...@mathematical.coffee.gmail.com', 'windows-alt-...@tglman.org']"
   b'org.gnome.shell' b'command-history' redacted by apport
   b'org.gnome.shell' b'favorite-apps' redacted by apport
   b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
  InstallationDate: Installed on 2018-05-25 (38 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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