WLAN cannot be enabled by hardware switch after suspend

I disable WLAN with the laptop switch. Then I suspend en wake-up. Now I use the laptop switch again to enable WLAN again. This does not work (no WLAN). I expect WLAN to toggle when using the hardware switch on the laptop.

It turns out that there is a software bit "Enable Wireless". I toggle this radio button (enable) it, WLAN works again. But I have never disabled WLAN by this software button.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: plasma-desktop 4:4.6.2a-0ubuntu5.1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
Uname: Linux 2.6.38-8-generic-pae i686
Architecture: i386
Date: Sun Jun 26 22:48:53 2011
ExecutablePath: /usr/bin/plasma-desktop
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kdebase-workspace
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 (knotify4:1670): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed
 (firefox-bin:1988): GLib-CRITICAL **: g_hash_table_insert_internal: assertion `hash_table != NULL' failed
 (kcmshell4:3224): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed
 (firefox-bin:7985): GLib-CRITICAL **: g_hash_table_insert_internal: assertion `hash_table != NULL' failed
 (kcmshell4:8447): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed