[Asus M4A87TD EVO] If USB3 is enabled, kernel hangs when intilizing ethernet

My motherboard has two USB3 ports. If the USB3 ports *and* the builtin ethernet NIC are enabled, I cannot boot successfully... kernel apparently hangs when initializing the ethernet port. If I disable at least one, it can boot. Currently disabled USB3 so I have networking.

I tried booting into the Maverick live environment (from a USB drive) and this problem is not present under Maverick... boots fine even if both USB3 and ethernet are enabled.

This is repeatable every time.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-6-generic 2.6.38-6.34
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: VT1818S Analog [VT1818S Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jderose 2003 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe8f4000 irq 16'
   Mixer name : 'VIA VT1818S'
   Components : 'HDA:11060440,10438417,00100000'
   Controls : 35
   Simple ctrls : 20
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfe9ec000 irq 45'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100100'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
CheckboxSubmission: fdbdfcded0c0bb479a6b52e9ec5af131
CheckboxSystem: edda5d4f616ca792bf437989cb597002
Date: Wed Mar 9 17:49:05 2011
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=b600dea1-6bb6-4305-847c-f2cfece99d84
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007.1)
IwConfig:
 lo no wireless extensions.

 eth3 no wireless extensions.
MachineType: System manufacturer System Product Name
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-6-generic root=UUID=383b9019-b3b0-4f11-bbf7-6d0968e3e04f ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-6-generic N/A
 linux-backports-modules-2.6.38-6-generic N/A
 linux-firmware 1.48
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to natty on 2011-01-30 (38 days ago)
dmi.bios.date: 12/09/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1102
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A87TD EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1102:bd12/09/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A87TDEVO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer