This became a problem for me on one system (of three) I upgraded to
Hardy.  The 'options forcedeth msi=0 msix=0' fix seems to be working on
Hardy.  Never had an issue that I am aware of on Gutsy involving
forcedeth.

I seem to be able to reproduce a loss of network (using synaptic, for
example) without the fix in place.  Is there some debugger I can run on
this, or is this bug adequately documented already?

Here's lspci -v

00:08.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a2)
        Subsystem: ASUSTeK Computer Inc. Unknown device 8239
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 10
        Memory at fe02a000 (32-bit, non-prefetchable) [size=4K]
        I/O ports at b000 [size=8]
        Memory at fe029000 (32-bit, non-prefetchable) [size=256]
        Memory at fe028000 (32-bit, non-prefetchable) [size=16]
        Capabilities: [44] Power Management version 2
        Capabilities: [70] MSI-X: Enable- Mask- TabSize=8
        Capabilities: [50] Message Signalled Interrupts: Mask+ 64bit+ Queue=0/3 
Enable-
        Capabilities: [6c] HyperTransport: MSI Mapping

On an Asus M2N SLi mobo

-- 
Ethernet (nVidia MCP55) not working [ gutsy, hardy]
https://bugs.launchpad.net/bugs/136836
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