Same issue also here. (Ubuntu 9.04)
1 - uname -a : "Linux natnb 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17
01:57:59 UTC 2009 i686 GNU/Linux"
2 - sudo lspci -vvnn:
02:03.0 Network controller [0280]: Broadcom Corporation BCM4306 802.11b/g
Wireless LAN Controller [14e4:4320] (rev 03)
Subsystem: Hewlett-Packard Company Device [103c:12f4]
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: 32
Interrupt: pin A routed to IRQ 21
Region 0: Memory at d2004000 (32-bit, non-prefetchable) [size=8K]
Kernel driver in use: b43-pci-bridge
Kernel modules: ssb
3 - lshw -C network:
*-network:0
description: Ethernet interface
product: RTL-8139/8139C/8139C+
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: p...@0000:02:00.0
logical name: eth0
version: 10
serial: 00:c0:9f:3a:a3:41
size: 10MB/s
capacity: 100MB/s
width: 32 bits
clock: 33MHz
capabilities: pm bus_master cap_list ethernet physical tp mii 10bt
10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=8139too
driverversion=0.9.28 duplex=half latency=32 link=no maxlatency=64 mingnt=32
module=8139too multicast=yes port=MII speed=10MB/s
*-network:1
description: Network controller
product: BCM4306 802.11b/g Wireless LAN Controller
vendor: Broadcom Corporation
physical id: 3
bus info: p...@0000:02:03.0
version: 03
width: 32 bits
clock: 33MHz
capabilities: bus_master
configuration: driver=b43-pci-bridge latency=32 module=ssb
*-network:0 DISABLED
description: Ethernet interface
physical id: 1
logical name: pan0
serial: d6:b9:7f:c3:7c:c6
capabilities: ethernet physical
configuration: broadcast=yes driver=bridge driverversion=2.3
firmware=N/A link=yes multicast=yes
*-network:1
description: Wireless interface
physical id: 2
logical name: wlan0
serial: 00:90:4b:54:31:b9
capabilities: ethernet physical wireless
configuration: broadcast=yes ip=192.168.0.2 multicast=yes wireless=IEEE
802.11bg
** Attachment added: "dsmeg"
http://launchpadlibrarian.net/26544667/dmesg.log
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Wireless connection lost during heavy network load.
https://bugs.launchpad.net/bugs/190144
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