[Natty-Beta2] Wireless hot-switch off causes ssytem freeze on Dell Vostro 3500 Laptop

Switching off the wireless adapter from the hard switch causes a system freeze. Couldn't recover it since keyboard and mouse weren't responding.
My steps to reproduce this:
 # Turned on machine, login.
 # Connected wireless, bluetooth on.
 # Noticed wireless LED indicator was off (Bug #753857), but desktop indicator was on and connected successfully to my home network. Internet working (it is now, as I'm reporting from Natty).
 # Switched off wireless adapter from the hard-switch provided in my laptop. Bluetooth LED turned off immediately, so did desktop indicator. Wireless desktop indicator was still on.
 # After a second, system was frozen. Got to turn off from Power button.

Tried the same steps after installing proprietary driver and the same issue was present (Bug #753857 too).

I consider this a regression, since it works fine on Maverick with kernel 2.6.35-28 with Broadcom proprietary driver installed.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: joaquin 1327 F.... pulseaudio
CRDA: Error: [Errno 2] No existe el fichero o el directorio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfb400000 irq 48'
   Mixer name : 'IDT 92HD81B1X5'
   Components : 'HDA:111d7605,10280441,00100105'
   Controls : 14
   Simple ctrls : 9
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xfa080000 irq 17'
   Mixer name : 'Nvidia GPU 0b HDMI/DP'
   Components : 'HDA:10de000b,10de0101,00100200'
   Controls : 16
   Simple ctrls : 4
Date: Sat Apr 16 14:51:22 2011
HibernationDevice: RESUME=UUID=d5351580-0833-43fe-ae8c-5434a1a56944
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
MachineType: Dell Inc. Vostro 3500
ProcEnviron:
 LANGUAGE=es:en
 LANG=es_AR.UTF-8
 LC_MESSAGES=es_ES.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=90ac3929-a63c-4636-a46d-a240c2139281 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.50
SourcePackage: linux
StagingDrivers: brcm80211
Title: [STAGING]
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/10/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A08
dmi.board.name: 0NVXFV
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA08:bd09/10/2010:svnDellInc.:pnVostro3500:pvrNotSpecified:rvnDellInc.:rn0NVXFV:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Vostro 3500
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.