Erratic trackpad when ethernet plugged in

Hi,
I've got a brand new MBP 15" with a trackpad that works perfectly while on wireless. However, as soon as I plug in an ethernet cable - even when the network is not being used - the trackpad immediately becomes erratic and unusable.
As soon as I unplug the ethernet cable, the trackpad reverts to working fine again.
It only seems to be a problem when on battery.
There's a post from Jan 2010 that reports exactly the same problem but is now archived so I can't respond to it.
To summarise,
Ethernet cable plugs in --> Trackpad doesn't track correctly.
Ethernet cable out --> Trackpad tracks fine.
Is this a known problem ? Should I be taking the laptop back to Apple ?
Thanks !
Andrew

Hi,
AS the MacBook Pro is new I would take advantage of the Service and AppleCare level you still have.
10:02 PM Tuesday; September 21, 2010

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com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.iokit.IONDRVSupport          2.3.6
com.apple.driver.AppleGraphicsControl          3.4.12
com.apple.kext.AMDSupport          1.1.4
com.apple.AppleGraphicsDeviceControl          3.4.12
com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.AppleSMBusPCI          1.0.12d1
com.apple.driver.AppleSMC          3.1.6d1
com.apple.driver.AppleSMBusController          1.0.11d1
com.apple.driver.IOPlatformPluginFamily          5.5.1d27
com.apple.driver.AppleHDAController          2.5.2fc2
com.apple.iokit.IOGraphicsFamily          2.3.6
com.apple.iokit.IOHDAFamily          2.5.2fc2
com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
com.apple.driver.AppleThunderboltDPAdapterFamily          2.5.0
com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.0
com.apple.driver.AppleUSBMultitouch          240.6
com.apple.iokit.IOUSBHIDDriver          650.4.4
com.apple.driver.AppleUSBMergeNub          650.4.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.6.0
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.iokit.IOAHCISerialATAPI          2.6.0
com.apple.driver.AppleThunderboltNHI          1.9.2
com.apple.iokit.IOThunderboltFamily          2.8.5
com.apple.iokit.IOUSBUserClient          650.4.4
com.apple.iokit.IOEthernetAVBController          1.0.3b3
com.apple.driver.mDNSOffloadUserClient          1.0.1b4
com.apple.iokit.IO80211Family          600.34
com.apple.iokit.IONetworkingFamily          3.2
com.apple.iokit.IOFireWireFamily          4.5.5
com.apple.iokit.IOAHCIFamily          2.6.0
com.apple.driver.AppleEFINVRAM          2.0
com.apple.driver.AppleEFIRuntime          2.0
com.apple.iokit.IOHIDFamily          2.0.0
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          278.10
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.AppleKeyStore          2
com.apple.driver.DiskImages          371.1
com.apple.iokit.IOReportFamily          21
com.apple.driver.AppleFDEKeyStore          28.30
com.apple.iokit.IOUSBMassStorageClass          3.6.0
com.apple.driver.AppleUSBComposite          650.4.0
com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.0
com.apple.iokit.IOStorageFamily          1.9
com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
com.apple.iokit.IOUSBFamily          650.4.4
com.apple.driver.AppleACPIPlatform          2.0
com.apple.iokit.IOPCIFamily          2.8
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.pthread          1
com.apple.kec.corecrypto          1.0
Model: MacBookPro8,3, BootROM MBP81.0047.B27, 4 processors, Intel Core i7, 2.4 GHz, 8 GB, SMC 1.70f6
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 512 MB
Graphics: AMD Radeon HD 6770M, AMD Radeon HD 6770M, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3037332E4130304C4620
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3037332E4130304C4620
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.100.22)
Bluetooth: Version 4.2.0f6 12982, 3 services, 23 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: WDC WD10JPVT-22A1YT0, 1 TB
Serial ATA Device: MATSHITADVD-R   UJ-8A8
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: Apple Internal Keyboard / Trackpad
USB Device: BRCM2070 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Hub
USB Device: Fast Track Ultra
USB Device: IR Receiver
Thunderbolt Bus: MacBook Pro, Apple Inc., 25.1

Hi monicaxh1,
Here is an article of troubleshooting for when your iPod does not appear in iTunes:
iPod not appearing in iTunes
http://support.apple.com/kb/ts3716
The issues you are seeing may be connected, so I would try this troubleshooting first.
Cheers!
- Ari

Erratic trackpad when ethernet plugged in

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