Unstable wireless connection, with different wireless adapters and different routers

[shealtiel]

I bought a new powerful Lenovo laptop around a year ago

The laptop had problems with wireless connection from the beginning
I initially thought that it is a problem with the quality of the internet connection of my landlord which I used.
Than I so that I have the same problem in other places. Below are the details as I observed them:

The symptom: internet connection is very unstable. It becomes rather very slow, or, disconnects frequently (the WLAN connection itself between my laptop and the router).

I noticed that it happens with some of the routers at the places I visit, and doesn't happen (to the level of no problem at all) with some others. I can't characterize the pattern more, I just know that I had the problem at 3 out of the last 5 places where I spent long periods of time recently.

I also tried:
- Replacing the wireless adapter built in in the laptop, by plugging an outer adapter via USB and using it instead. Surprisingly it did not help, and I tried two completely different USB adapters.
- Completely uninstalling the driver of the wireless adapter of the laptop, and installing the latest from the manufacturers site.
- Disabling all the other network adapters in the computer (like the LAN, and some virtual ones)

So I'm in a tricky situation.
It doesn't seem to a problem with the adapter, because I replaced it and had the problem still.
It doesn't seem to a problem with the router or the internet connection between the router and the ISP, because the problem occures in a very similar way at different places I visit.

So it seems to be somehow a problems with something else in the computer.
And I'm clue less what can it be

Please help.
I'm willing to supply more information if you point at something specific that you need

---

The computer:
Lenovo ideapad, G510
CPU intel i7 quad
16gb DDR3 RAM
256 SSD drive

Broadcom pciexress half mini card, b/g/n wireless adapter

It came with an OS installed by the store rather than Lenovo itself. That is because I chose windows 7. So they sold me a laptop with no Lenovo-preinstalled os, and installed a legal copy of windows 7 home premium, by themselves.

 

[Emulex]

I have had the same laptop, the built in power management would defeat the drivers ability to maintain high power. It would come out as a drop in MBPS connect rate after a period of idle time. down to 1mbps and then LOS of wifi.

I could not remove the power management driver from lenovo's bundle of mess drivers! Ended up ditching that G510 pos.

It is effected by battery/AC adapter and time of idle, reducing bitrate to reduce power drain based on some sort of Lenovo witchcraft!

 

[shealtiel]

I have had the same laptop, the built in power management would defeat the drivers ability to maintain high power. It would come out as a drop in MBPS connect rate after a period of idle time. down to 1mbps and then LOS of wifi.

I could not remove the power management driver from lenovo's bundle of mess drivers! Ended up ditching that G510 pos.

It is effected by battery/AC adapter and time of idle, reducing bitrate to reduce power drain based on some sort of Lenovo witchcraft!

Wow this is interesting.
How did you figure this out? That this is indeed the rootcause of the problem?

And, any official reference to this phenomena?

 

[Emulex]

No the laptop was unusable due to it's desire to go to 1mbps and then drop connection .

here's a recent thread about similar wifi issues for g510: https://forums.lenovo.com/t5/Lenovo...s/Lenovo-G510-wifi-problem-Solved/m-p/1525608

 

[JackMDS]

Hmm.. This does not explain the Problem with the Wireless USB.

If it was mine, I would takeout the Native Wireless card. Wipe the Hard Drive and reinstall Win 7 without Native Wireless card.

Then try again a USB Wireless, and make sure that it is installed with Pure Drivers. No manager and any other are needed cr*p. Just pure Drivers.

 

[Emulex]

As I said, I could not disable the power management driver that was installed with the machine which kept overriding the broadcom card with power save feature so regardless if the broadcom driver said MAX POWER state, it would shift into reduced power state and wifi would suck ballz!

I tell you i've never ditched a laptop so quickly before!

 

[ch33zw1z]

Try a BIOS Update. Check BIOS to ensure power savings it disabled for everything and see what happens.

there's also a System Update program Lenovo offers to do both software and BIOS, but I wouldn't do the BIOS through Windows. I would take the software updates. Lots of fixes in there.