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after almost two days of goggling my wifi problem. There is no answer, so i came here for some help. So my laptop is a dell 14z with BCM43142 on Ubuntu 14.10.

The problem is that the wifi is really slow, sometimes drops down and also ask for the password.

Here some info: http://pastebin.com/4uxAaANf

Posts checked without success:

Installing Broadcom Wireless Drivers how to enable drivers for BCM43142 https://askubuntu.com/a/460616/62483

Thanks!

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You might wanna downgrade the driver cause I have the same card and this:

Lenovo ThinkPad E545

Network controller : Broadcom Corporation BCM43142 802.11b/g/n (rev 01)

If you are using this WIFI card, beware that bcmwf-kernel-source does perform very badly with a newer version of the bcmwf-kernel-source 6.30.223.248-bdcom-0ubuntuXX (XX I have tried them all and all are crap)

Desripction of what is happening:

You are connnected to a network and when you are at signal level cca 55% and less the internet drops and you are offline for a long period of time (restarting card works for a few moments when the drop occurs again)

Solution: You want to downgrade to a bcmwf-kernel-source 6.30.223.141 (Lock it and don't update it) + To be sure I also downgrade linux-firmware from 1.127.12 to 1.127, just to be sure

Alternative solution: I have read a lots of lenovo users have this kind of a problem and it was DUE a unstable N module in the driver, so you might wanna disable N module of the new bcmwf. Look it up how to, I am OK with just downgrade.

Anyone from LINUX MINT TEAM please include a backport version of bcmwf-kernel-source 6.30.223.141 to a linux mint 17.2 :)

Possible WARNINGS: bcmwf-kernel-source 6.30.223.141 might not be included in Linux MINT 17.2 as the newer versions are believed to be working properly.

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  • Thanks for the answer, I installed the 6.30.223.141 version a few months ago and now everything is running okay. In my case it was not necessary to downgrade the linux-firmware. So yes, this is the best solution for now.
    – Matias
    Jun 28, 2015 at 23:25

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