Z wireless Speed Down From 90Mbps to 1Mbps when Lid Closed?

I just found this weird occurence. I often use my Vaio Z with external monitor. So most of the time I have my lid closed. Accidentally I was opening my Network Status and noticed that my wireless speed was only 1Mbps which was pretty aweful for an N speed. I was pulling my hair off, trying to figure out the problem with the setting. By looking at the signal, it was still pretty decent 3 bars.

Finally I found out that, whenever I opened the Sony Z lid , the speed would jumped up to 90Mbps and over maximizing around 150Mbps. Surprisingly the signal quality remained the same around 3 bars.

Did anybody experience this as well? Is it normal? Why did this happen?



I already turned off power management for wireless Intel 5100 AGN as well.

 

I have the same problem with Atheros wireless card and my laptop is Vaio SR ,

 

Right-click the battery in the systray, and choose "Power Options".
Select "Change Plan Settings" beneath the active plan.
After the window changes, Select "Change advanced power settings"
In the new window, scroll until you find "Wireless Adapter settings". Expand it, then expand "Power Saving Mode".
Make sure that "Power Saving Mode" is set to "Maximum Performance" for both "On Battery" and "Plugged In".

 

Hey Arth1,

Thanks for the input. I have set Power Save Mode to Maximum Performance, but the problem still persists.

 

Also keep in mind that the antenna is in the bezel for the screen. By folding down the screen on top of the aluminium keyboard plate, you will necessarily get somewhat worse reception. If angling the computer doesn't improve the results, you may have to get a wifi expresscard (or even a wifi card that allows for an external antenna).