brcmsmac problems

brcmsmac problems

[Vadim A. Misbakh-Soloviov]

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Hello there!
Unfortunately, all the time I use laptops with broadcom WiFi cards I
experience problems with them. So, I feel unlucky with it.

Currenlty, I've Lenovo IdeaPad B570 laptop with
>> 03:00.0 Network controller [0280]: Broadcom Corporation BCM4313
802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)

First of all, I can't get it to work on 11n wifi. My maximum
download/upload speed is 1.7-2 Mbytes/s, while if I insert atheros card
— I get 8-10Mbytes/s. And NetworkManager says "connection speed" is
12-18-28.9Mb/s on bcm4313 and 140+Mb/s on atheros. So, I guess it really
works in 11g, but not 11n.

Secondly, I've a bunch of issues with it:
I can't get it to work with broadcom-sta (wl) driver, so using
b43/brcmsmac for a long time.
All the time I using it — sometimes I experience connection-freezes (no
incoming packets from AP) for few minutes, or until I stop services like
avahi or torrent or IMAP-client.
Sometimes I even experience reconnect-loops, and sometimes I even
experience kernel-oops like this:

Jan  6 19:23:51 localhost kernel: [77873.116584] ------------[ cut here
]------------
Jan  6 19:23:51 localhost kernel: [77873.116611] WARNING: at
drivers/net/wireless/brcm80211/brcmsmac/main.c:7993
brcms_c_wait_for_tx_completion+0x91/0xa0 [brcmsmac]()
Jan  6 19:23:51 localhost kernel: [77873.116615] Hardware name:
HuronRiver Platform
Jan  6 19:23:51 localhost kernel: [77873.116618] Modules linked in:
vhba(O) brcmsmac brcmutil b43 ssb bcma mac80211 bbswitch(O)
Jan  6 19:23:51 localhost kernel: [77873.116637] Pid: 21940, comm:
kworker/u:2 Tainted: G           O 3.7.1-geek-note #1
Jan  6 19:23:51 localhost kernel: [77873.116640] Call Trace:
Jan  6 19:23:51 localhost kernel: [77873.116664]  [<ffffffff81004988>]
dump_trace+0x88/0x300
Jan  6 19:23:51 localhost kernel: [77873.116679]  [<ffffffff81b3915e>]
dump_stack+0x72/0x78
Jan  6 19:23:51 localhost kernel: [77873.116684]  [<ffffffff8105d9eb>]
warn_slowpath_common+0x7b/0xc0
Jan  6 19:23:51 localhost kernel: [77873.116690]  [<ffffffffa00f8421>]
brcms_c_wait_for_tx_completion+0x91/0xa0 [brcmsmac]
Jan  6 19:23:51 localhost kernel: [77873.116709]  [<ffffffffa00eb1a2>]
brcms_ops_flush+0x32/0x50 [brcmsmac]
Jan  6 19:23:51 localhost kernel: [77873.116717]  [<ffffffffa0029ecc>]
ieee80211_mgd_probe_ap.part.44+0x12c/0x150 [mac80211]
Jan  6 19:23:51 localhost kernel: [77873.116754]  [<ffffffff81074b42>]
process_one_work+0x112/0x370
Jan  6 19:23:51 localhost kernel: [77873.116758]  [<ffffffff8107633a>]
worker_thread+0x15a/0x3e0
Jan  6 19:23:51 localhost kernel: [77873.116762]  [<ffffffff8107af03>]
kthread+0xb3/0xc0
Jan  6 19:23:51 localhost kernel: [77873.116766]  [<ffffffff81b469ac>]
ret_from_fork+0x7c/0xb0
Jan  6 19:23:51 localhost kernel: [77873.116770] ---[ end trace
37aa45c524256334 ]---

Can somebody help me to debug this issue and finally fix it?

--
Best regards,
mva


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