Ethernet doesn't work on Thinkpad T42p

Discussion in 'Windows Vista General Discussion' started by Ron Lautmann, May 4, 2008.

  1. Ron Lautmann

    Ron Lautmann Guest

    After installing SP1 on my laptop the hard wired ethernet works
    intermittently. The DHCP connection is successful but when I try to ping
    something most of the pings don't work. Looking at the ethernet socket I can
    see the green LNK light goes out about once every 30 seconds.

    I have uninstalled and reinstalled the driver as well as the device. Also,
    since the machine is still in warranty the manufacturer replaced the mother
    board which contains the ethernet hardware.

    This one is baffling.
    Ron Lautmann, May 4, 2008
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  2. You have a driver for the Ethernet card that needs improvement. Lenovo
    hasn't seemed that forthcoming, so far.
    I have a poor workaround that will let you get the card working, but it's no
    permanent solution.
    Open Device Manager to the Ethernet Properties, and the Speed tab. Change
    the setting from 'auto-negotiate' to the lowest setting, and test the
    connection. Work your way up to the best speed you can get.
    If it fails anytime after that, change lower, then back.
    All this seems to 'reset' this driver enough to allow normal speeds for a
    while, or till a restart. Mine seems to keep going all the time on the
    lowest speed, which matches my Inet connection speed anyway. (slow
    I have no idea why this works, or how to inspire the driver maker to do
    Was this helpful? Then click the Ratings button. Voting helps the web
    Mark L. Ferguson
    Mark L. Ferguson, May 4, 2008
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  3. Ron Lautmann

    Ron Lautmann Guest


    I tried changing the speed from "autonegotiate" to "10MB Full Duplex" and
    "10 MB half duplex" and something changed such that the LNK light no longer
    goes out but the networking performamce is still unreliable. Same with
    changing it to "100mb full duplex".

    Have you already talked to Lenovo support about this problem? What do they
    say? Maybe if we get enough people with the problem they will do something
    to solve it. The last time I called them they said that they would not help
    fix the problem because it didn't occur with the original image on the
    machine which was XP Professional. I updated to Vista Ultimate myself.

    Also, what model Thinkpad do you have? And, have you heard of other people
    with this problem?
    Ron Lautmann, May 5, 2008
  4. Ron Lautmann

    Ron Lautmann Guest

    Ron Lautmann, May 5, 2008
  5. the wharf rat, May 5, 2008
  6. Ron Lautmann

    Ron Lautmann Guest

    I tried the driver posted on the IBM/Lenovo site but it didn't fix the
    Ron Lautmann, May 6, 2008
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