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I have a BCM43142: 

01:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Lenovo Device [17aa:0611]
    Flags: bus master, fast devsel, latency 0, IRQ 18
    Memory at b0400000 (64-bit, non-prefetchable) [size=32K]
    Capabilities: <access denied>
    Kernel driver in use: wl

And I can only get wifi networks to show up with the wl driver, from bcmwl-kernel-source. I blacklisted the other drivers as necessary. When using wl, my connection is often five or six times slower than on Windows, and usually cuts out after about a minute or so. I can reconnect to the network, but then it cuts out again after about a minute. How can I get it to work reliably?

Everything works fine on Windows with this wifi card, and other devices on the network work fine.

I should mention that I'm running 14.10 with all the latest updates.

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possible duplicate of Installing Broadcom Wireless Drivers – Eric Carvalho Jul 4 '15 at 13:37
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I believe that one or more drivers that require blacklisting are still loading. Please open a terminal and do:

sudo -i
echo "blacklist b43"  >>  /etc/modprobe.d/blacklist.conf
echo "blacklist bcma"  >>  /etc/modprobe.d/blacklist.conf
echo "blacklist brcmsmac"  >>  /etc/modprobe.d/blacklist.conf
echo "blacklist ssb"  >>  /etc/modprobe.d/blacklist.conf
exit

Reboot and run again:

lspci -v

We hope we see the driver in use is only wl and not bcma, bcma-pci-bridge, etc. and that your wireless works as expected.

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yes. bcma-pci-bridge should not be the module in use but wl. I already have a /etc/modprobe.d/blacklist-bcm43.conf here. I wonder if it's bcmwl-kernel-source that created it or not – solsTiCe Dec 14 '14 at 17:47
    
The lspci output in my question showed bcma-pci-bridge instead of wl, since I was trying that driver at the time. But my main problem is that when I'm using wl, and only wl, then my wifi cuts out every minute or so. I blacklisted all the other drivers like you suggest, but the problem is not loading the driver, the problem is that the driver, when properly loaded, isn't working well--my wifi keeps cutting out every minute, and is excruciatingly slow. I'll edit my question to reflect my current lscpi output. – Jon Dec 14 '14 at 18:03
    
this is the "official" driver for this hardware. Look in /var/log/syslog to see for NetworkManager log (if you use it) to see if it's not the router's fault that disconnect you – solsTiCe Dec 14 '14 at 18:29
    
You might post: dmesg | grep -e wlan -e wl Thanks. – chili555 Dec 14 '14 at 22:23

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