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unstable Wireless-LAN: "connected" but nothing gets through
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Lebkoungcity
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Joined: 16 Nov 2008
Posts: 121
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PostPosted: Sun Sep 21, 2014 3:16 pm    Post subject: unstable Wireless-LAN: "connected" but nothing get Reply with quote

Hi,

since I replaced the wireless-LAN-Adapter-card in my ThinkPad R40 the connection is sometimes "lost": When I boot the machine the wireless-LAN connection is established and usable at full speed. But sometimes the connection is still shown as "connected" by wicd but no data gets through it. I think it is related to times when there is heavy traffic between the ThinkPad and the desktop-PC which I use as NFS-Server for portage and as distcc-helper for the laptop.

When I used the old Intel PRO/Wireless 2100 Network Connection 802.11b wireless network adapter card the speed was kind of low (because it is a 802.11b card) but it was stable.

The new card is this:
Code:
lspci -vv
[...]
02:02.0 Network controller: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller (rev 03)
        Subsystem: Broadcom Corporation Device 0453
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 64
        Interrupt: pin A routed to IRQ 11
        Region 0: Memory at c0204000 (32-bit, non-prefetchable) [size=8K]
        Kernel driver in use: b43-pci-bridge
        Kernel modules: ssb

[...]


My kernel is configured with these settings:
Code:

[...]
<M>   Broadcom 43xx wireless support (mac80211 stack)
[ ]     Broadcom 43xx PCMCIA device support
[ ]   Support for 802.11n (N-PHY) devices
[ ]   Support for low-power (LP-PHY) devices
[ ]   Broadcom 43xx debugging
< >   Broadcom 43xx-legacy wireless support (mac80211 stack)
< >   Broadcom IEEE802.11n PCIe SoftMAC WLAN driver
< >   Broadcom IEEE802.11n embedded FullMAC WLAN driver
< >   IEEE 802.11 for Host AP (Prism2/2.5/3 and WEP/TKIP/CCMP)
<M>   Intel PRO/Wireless 2100 Network Connection
[*]     Enable promiscuous mode
[ ]     Enable full debugging output in IPW2100 module.
[...]


Then I emerged
Code:

sys-firmware/b43-firmware-5.100.138:b43

which pulled in
Code:

net-wireless/b43-fwcutter-018


Afterwards I could use the card but with the described issues...

What can I do to track down the problem? Where should I start?

Greetings from Franconia,
Andy
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Lebkoungcity
Tux's lil' helper
Tux's lil' helper


Joined: 16 Nov 2008
Posts: 121
Location: Lebkoungcity (='Gingerbreadcity' =Nuremberg)

PostPosted: Tue Sep 23, 2014 9:31 am    Post subject: Reply with quote

After some more reading I've taken out powersave. Now the section 'wireless' under 'Networking support' looks like this:

Code:

--- Wireless
<*>   cfg80211 - wireless configuration API
[ ]     nl80211 testmode command
[ ]     enable developer warnings
[ ]     cfg80211 regulatory debugging
[ ]     enable powersave by default
[ ]     cfg80211 DebugFS entries
[*]     cfg80211 wireless extensions compatibility
[ ]   lib80211 debugging messages
<*>   Generic IEEE 802.11 Networking Stack (mac80211)
  Default rate control algorithm (Minstrel)  --->
[ ]   Enable mac80211 mesh networking (pre-802.11s) support
[*]   Enable LED triggers
[ ]   Export mac80211 internals in DebugFS
[ ]   Trace all mac80211 debug messages
[ ]   Select mac80211 debugging features  ----


But it's still the same... It's really annoying - right now I emerge libreoffice and it should have been finished for hours but the connection with the distcc-helper-machine was down without a notification...
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Lebkoungcity
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Joined: 16 Nov 2008
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Location: Lebkoungcity (='Gingerbreadcity' =Nuremberg)

PostPosted: Sat Oct 04, 2014 9:45 am    Post subject: Reply with quote

OK, I played around with the settings in the kernel and the settings my router provides - but nothing seemed to help.

By accident I discovered that the connection is kept up when I let the ThinkPad ping the other machine all the time.

Might this help to narrow the issue?

Greetings,
Andy
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v_andal
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PostPosted: Mon Oct 06, 2014 7:29 am    Post subject: Reply with quote

Have you tried downgrading firmware for broadcom card? In my case it solved the issue with stability.
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666threesixes666
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PostPosted: Mon Oct 06, 2014 7:43 am    Post subject: Reply with quote

ditto roll back your drivers.... not only does it mess with the bandwidth of the broadcom machine, it also kills everyone elses wifi connections.
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Lebkoungcity
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Posts: 121
Location: Lebkoungcity (='Gingerbreadcity' =Nuremberg)

PostPosted: Mon Oct 06, 2014 11:02 pm    Post subject: Reply with quote

Thank you for your suggestion! Unfortunately, the installed one is the lowest version of sys-firmware/b43-firmware in the portage-tree, so I'd have to get it from somewhere else. Which version would you suggest to try?

edit:
I've already tried it with the other version in portage (6.30.163.46) - the connection was as unstable as with version 5.100.138...
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