Keystroke ctrl+shift+L is absorbed

[Ricky Seltzer]

Description: Ubuntu 13.10
Release: 13.10
Dell Inspiron i3 laptop, 64-bit Linux. Inspiron N4110.

In the recovery-mode bash shell, ctrl+shift+K and ctrl+shift+L both work.
 I test them by typing into the shell
ctrl+V, ctrl+shift+K, or L. They both work, and display as ^K or ^L respectively.

In terminal mode under Unity, the ctrl+shift+K works the same way, but the ctrl+shift+L is simply absorbed by something
before hitting the terminal. This happens both on my USB keyboard and the built-in laptop keyboard.

I've looked through all of the settings I can find, including Unity and Ubuntu tweak programs, and the ctrl+shift+L does not appear.

My editor has a command mapped to ctrl+shift+L , and that command did not work. So I noticed this.
The problem turned out to be the keystroke is not seen, and not in the editor.

--------------------------------------------------------------------------------------------------------------
Xev shows different kinds of output from ctrl+shift+K and ctrl+shift+L:

    **** First Ctrl+Shift+K, key-up and key-down: ****
KeyPress event, serial 28, synthetic NO, window 0x6800001,
root 0x91, subw 0x0, time 20311193, (146,80), root:(1507,132),
state 0x15, keycode 45 (keysym 0x4b, K), same_screen YES,
XLookupString gives 1 bytes: (0b) "
"
XmbLookupString gives 1 bytes: (0b) "
"
XFilterEvent returns: False

KeyRelease event, serial 28, synthetic NO, window 0x6800001,
root 0x91, subw 0x0, time 20311305, (146,80), root:(1507,132),
state 0x15, keycode 45 (keysym 0x4b, K), same_screen YES,
XLookupString gives 1 bytes: (0b) "
"
XFilterEvent returns: False

   **** Now Ctrl+Shift+L, key-up and key-down are only one event! *****
KeymapNotify event, serial 28, synthetic NO, window 0x0,
keys: 4294967185 0 0 0 32 0 4 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

--------------------------------------------------------------------------------------------------------------
The forum question I asked is here: http://ubuntuforums.org/showthread.php?t=2187245&p=12844914#post12844914

My system bios is up-to-date, A12.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: keyboard-configuration 1.70ubuntu7
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Wed Nov 13 13:07:47 2013
InstallationDate: Installed on 2013-07-16 (119 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: console-setup
UpgradeStatus: Upgraded to saucy on 2013-10-19 (24 days ago)