Are you sure this is the failure case?  I ask since it seems like the
e1000e is claiming the device and assigning it irq 47 for use with MSI
based on the snippet from the log below.  I would have expected to see
an error stating that it failed to load the driver on the interface.

Thanks,

Alex

On 11/08/2012 10:31 AM, Mark Bidewell wrote:
> Thanks.  Here is the logging in the failure case:
> [    1.139788] e1000e: Intel(R) PRO/1000 Network Driver - 2.0.0-k
> [    1.139791] e1000e: Copyright(c) 1999 - 2012 Intel Corporation.
> [    1.139828] e1000e 0000:00:19.0: >setting latency timer to 64
> [    1.139899] e1000e 0000:00:19.0: >Interrupt Throttling Rate (ints/sec) set 
> to dynamic conservative mode
> [    1.139934] e1000e 0000:00:19.0: >irq 47 for MSI/MSI-X
> I have been tracking the issue with Ubuntu here:  
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1072722
>
>
> On Thu, Nov 8, 2012 at 1:04 PM, Alexander Duyck
> <alexander.h.du...@intel.com <mailto:alexander.h.du...@intel.com>> wrote:
>
>     Mark,
>
>     I could recommend checking the dmesg log after you have
>     unloaded/reloaded the e1000e driver.  There is likely an error that is
>     being reported that is preventing the driver from loading and knowing
>     what the error is that is being reported would go a long way toward
>     telling us what the issue is.
>
>     The difference between the working and non-working case is likely
>     due to
>     the fact that the driver enables bus mastering and MSI interrupts once
>     it is loaded.  In the case where it didn't load it will not have
>     enabled
>     bus mastering or MSI interrupts.
>
>     Thanks,
>
>     Alex
>
>     On 11/08/2012 08:29 AM, Mark Bidewell wrote:
>     > Thank you, that is what I suspect but since it worked up until
>     recently, I
>     > thought it would be good to check.  I tried to recovery reflash
>     the BIOS
>     > after replacing the battery (I am already at the latest - so no
>     update)  no
>     > way to know if it actually did the reflash.  Should the e1000e
>     be able to
>     > support the HW configuration in the non-working case (IRQ 20, no
>     MSI, no
>     > bus master)?  Because even when lspci reports IRQ 20, e1000e
>     still looks at
>     > 46.
>     >
>     > Thanks
>
> -- 
> Mark Bidewell
> http://www.linkedin.com/in/markbidewell


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