My X61 can't connect wireless when i use battery!!!

Question

TYPE NO.:  7673-AN6
i confused why it can not connect wireless when i use battery?!
the problem drive me crazy nearly, it means i must take adapter every time
i help every one can help me!
cheers,

Answer 1

Most of the functionality and problems are in the drivers. The hardware tends to be discrete testable functions though these days there is a fair bit of functionality in the hardware. The hardware tends to be implementing better defined protocols where as the to and fro of the higher level protocols tend to be what varies from Access Point to Access Point. The 4965AGN is a fairly recent chip set and the drivers are far from smoothly running.
The problems can vary from AP to AP so may work at home but not at work etc. Some have reported here that the 4965AGN setup doesn't work with the Cisco 1200 Access Point and I have yet to be able to get it to work under Vista with the equipment at any New York Starbucks. T-mobile do use Cisco equipment but I don't know which models.
Anything you can do to simplify the situation helps. Maximum power. No security. Disable IPv6 on the connection etc. Just to give a rough idea of the kind of thing that might be wrong here are some of the things listed as known issues or fixed according to the readme of the driver (Originating from Intel) that was released for the 4965AGN on 4/11/08.
There are several authentication issues with EAP, PEAP and LEAP which will cause it not to authenticate. There are also Vista EAP issues and some things which may resolve with SP1 which was pushed out on update last week. So there are many comnbinations of situations which may not work and it is important to test with different access points. Authentication and security has more issues. Also at the higher speeds such as 54Mb some of the security mechanisms will not be able to keep up. AES is the only mechanism which Intel expects to work at 54Mb.
http://downloadmirror.intel.com/15806/ENG/relnotes.htm
There have also been past issues where the cards are silenced for twenty minutes after a failure to authenticate and in many cases the card will not be in a valid state after hibernation. It is noticable that when you phone T-mobile the first thing the tech has you do is completely shut the machine down - not hibernate - and begin afresh.
Once you have uninstalled and re-installed the drivers and connection manager a few times it is also possible to be having problems with junk left in the registry.
I don't recommend adding the 4965 drivers directly from the Intel site. I would wait for the one that has come through the Lenovo testing cycle.
In reality for those who don't want to make maintaining their laptop a serious hobby (Hopefully all of us - Far too much time is wasted on wireless) it is really a matter of rebooting your machine at a given access point. Trying your luck and then shutting it down and going somewhere else if it doesn't work. Use wires when you can. At home if your access point doesn't work check your configuratiions, temporarily remove all security, restore factory settings on the AP, reinstall from scratch and if it still doesn't work replace it with a different brand of Access Point.
Of course it is intended to just work and for 95+% of situations Wi-Fi does. The 4965AGN is newer so it has its fair share of early life issues to get resolved. Vista also still has issues. If the problem you are seeing is only when you are on batteries you are lucky and LANOgre's instructions may well solve it.
Message Edited by hiker on 05-19-2008 09:23 PM