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ASUS A52JB LAN issue after BIOS upgrade

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    #1

    ASUS A52JB LAN issue after BIOS upgrade

    Hi folks,
    I have a laptop ASUS A52JB which has lost any LAN capability after a bios upgrade.
    Everything works fine unless the eth. Any OS shows the same issue: network not present.
    Unfortunately there is no way to restore back the old bios.
    The motherboard is K52JB


    Do you have any suggestion for this problem?

    Thank you for your help
    Tags: None
    #2
    Re: ASUS A52JB LAN issue after BIOS upgrade

    Might sound stupid, but have you got the right date and time set?

    Comment

      #3
      Re: ASUS A52JB LAN issue after BIOS upgrade

      Sorry, last answer was intended for someone else!

      Maybe the update has disabled the LAN options in the BIOS - that would be worth checking. If all is ok in the BIOS, I'd be checking the network card in the device manager. If it shows that it is not working, you can uninstall it via the device manager, then when you reboot it should reinstall itself automatically.

      Comment

        #4
        Re: ASUS A52JB LAN issue after BIOS upgrade

        Originally posted by Taxman View Post
        Sorry, last answer was intended for someone else!

        Maybe the update has disabled the LAN options in the BIOS - that would be worth checking. If all is ok in the BIOS, I'd be checking the network card in the device manager. If it shows that it is not working, you can uninstall it via the device manager, then when you reboot it should reinstall itself automatically.
        Hi Taxman,
        Thank you for your reply.
        I guess the problem is somehow related to the bios upgrade since it appears to be a problem of many other users who have experienced a BIOS upgrade in such laptop.

        Obviously I have reloaded default setup from F10 function key, the LAN is enabled but still unavailable either in windows or Linux.
        Interesting , the chip which controls the LAN (jmicron jmc251) also controls the card reader, and it is working fine.
        Last edited by _max_; 12-14-2012, 12:22 AM.

        Comment

          #5
          Re: ASUS A52JB LAN issue after BIOS upgrade

          Could be any number of issues. I'm no expert but I've run into network problems a few times so I'll share a few ideas with you in the hope they might help. You sound very knowledgeable so I suspect I'll be telling you things you already know but I'll fire ahead anyway just in case.

          I'll take it for granted that you've already tried to reset your modem. You could also check to ensure all the necessary services are running (particularly TCP/IP) but I can't see that being the issue given that the LAN isn't working in linux either.

          Any idea if you have a valid MAC address? I've heard before of BIOS updates leaving the MAC address being recognised as a string of zeros rather than the proper number. You can check this and other network settings by opening a command prompt and typing:

          ipconfig /all

          Note above that there's a space before the slash.

          The MAC address is the one that says 'physical address'. If it's zeros then it's not being recognised properly. Disabling and re-enabling the card will normally sort that but I assume you've tried that already.

          You could try releasing and renewing the DHCP lease:

          ipconfig /release

          then

          ipconfig /renew

          The renew won't work though if the network is not being found at all.

          You could also do a loopback ping to test the TCP / IP protocols by going to the command prompt and typing:

          ping 127.0.0.1

          If you get an error message, that indicates that the TCP/IP protocols are not set correctly. You'd then be looking at having to set the protocols in the network connection settings.

          I'm not convinced though that any of these routes will sort your issues given that it isn't working in linux either, but hopefully these ideas might get you on track...

          Comment

            #6
            Re: ASUS A52JB LAN issue after BIOS upgrade

            taxman,

            the fact that the lan is not being recognized, you wont be able to get any info using ipconfig.

            what you are trying to discuss is a network connection issue, contrary to stated issue.

            Comment

              #7
              Re: ASUS A52JB LAN issue after BIOS upgrade

              Yes, the LAN is like a not available resource after a bios upgrade.
              I am thinking to replace the whole board, the jmicron is the chip just in the middle

              Comment

                #8
                Re: ASUS A52JB LAN issue after BIOS upgrade

                Hi folks,

                I have just discovered an important fact: by interacting with the OS it is possible to resume the ethernet port!

                For some hidden reasons, the BIOS resets the MAC address to FF:FF:FF:FF:FF:FF, an invalid address which makes impossible to activate the card at boot time. Infact by forcing the interface with a valid hex address, the resource becomes available and it can be used as usual.

                Now the point is how to cheat the BIOS...

                Comment

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