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SubjectRe: mcp55 forcedeth woes
(suitable cc's added)

On Mon, 13 Apr 2009 15:13:05 -0700 (PDT)
"Yan Seiner" <yan@seiner.com> wrote:

> I have a few Asus M2N-SLI deluxe mobos. These mobos have the MCP55
> chipset and two 1gb ethernet ports. Occasionally, and for no reason that
> I can figure out, these ports will die. There are various ways to try and
> fix these; they seem to be about 50% effective, and approach something
> akin to voodoo.
>
> Based on this discussion here:
>
> http://patchwork.kernel.org/patch/16212/
>
> I've gotten the ability to turn the ports on and off somewhat.
>
> For port 0,
>
> ethtool -s eth0 autoneg off speed 10 duplex full
>
> turns on the link, and gets me half-duplex, 10mb/sec. Not much, granted.
>
> ethtool -s eth0 autoneg off speed 100 duplex full
>
> causes the link to go up and down on about a 2 second cycle.
>
> ethtool -s eth0 autoneg on
>
> causes the link to drop.
>
> For port 1, the behavior is similar, except that I can get a stable 100
> mbit connection.
>
> So the problem is in the autoneg code. It's a driver issue as this is
> reported widely to work under windows of various flavors.
>
> I'm running 2.6.29.1; I'm ok with patching and building kernels, but I'm
> not a kernel hacker.
>
> What, if anything, can I provide and do to fix this?
>



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