ctrl key sticks while changing keyboard layout

Description: Ubuntu 11.10
Release: 11.10
Package: x11vnc 0.9.12-1build1

After upgrading to 11.10 there is a strange bug/problem in running x11vnc VNC session. CTRL keyboard sticks after changing keyboard layout with ctrl+shift (from US to RU for example). This ctrl "stickness" persists even for X session on the machine with the vnc server. Second ctrl press revokes a "sticking". Here is a start command for x11vnc (with keyboard debug):

x11vnc -debug_keyboard -xkb -repeat -scale 4/5 -bg -speeds dsl -nolookup -ncache 0 -solid -display :0 -many
-rfbauth ~/.vnc/passwd -desktop "VNC ${USER}@${HOSTNAME}" -allow 192.168.200. |grep -Eo "[0-9]{4}">~/.vnc/port.txt

Tried with different vnc clients and have the same issue.

Attached is x11vnc log for the following key sequence pressed:

"crtl+shift", "a", "s", "d", "f", ctrl, "a", "s", "d", "f"

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: x11vnc 0.9.12-1build1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Wed Oct 19 22:25:07 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 LANGUAGE=ru:en
 PATH=(custom, user)
 LANG=ru_RU.UTF-8
 LC_MESSAGES=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: x11vnc
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (5 days ago)