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Relative Linux newb, some past usage but by no means an expert.

Got a new ultrabook and ditched Windows completely.

Am having problems with signal strength over distance with the wireless connection.

Router and card are both N grade. Currently using the default driver.

Other laptops are getting very good range but this one the signal strength is dropping drastically proportionally with distance from router for example an older laptop running G wireless on XP gets 54Mbps at the same place the Novatech is picking up >1Mbps.

Perfect connection when stood near router, completely unusable at very short distances away.

Any help massively appreciated.

lspci:

Network controller: Intel Corporation Centrino Wireless-N 2230 (rev c4)

ifconfig:

eth0 Link encap:Ethernet HWaddr 4c:72:b9:e3:62:95 
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback 
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:878 errors:0 dropped:0 overruns:0 frame:0
TX packets:878 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0 
RX bytes:83569 (83.5 KB) TX bytes:83569 (83.5 KB)

wlan0 Link encap:Ethernet HWaddr 84:a6:c8:0a:5b:95 
inet addr:192.168.0.15 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::86a6:c8ff:fe0a:5b95/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8414 errors:0 dropped:0 overruns:0 frame:0
TX packets:8410 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000 
RX bytes:5031950 (5.0 MB) TX bytes:1527279 (1.5 MB)

iwconfig wlan0:

wlan0 IEEE 802.11bgn ESSID:"cookiemonster" 
Mode:Managed Frequency:2.437 GHz Access Point: 00:8E:F2:A5:92:E4 
Bit Rate=1 Mb/s Tx-Power=16 dBm 
Retry long limit:7 RTS thrff Fragment thrff
Power Managementff
Link Quality=30/70 Signal level=-80 dBm 
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:7 Invalid misc:26 Missed beacon:0

sudo lshw -C network:

*-network 
description: Wireless interface
product: Centrino Wireless-N 2230
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlan0
version: c4
serial: 84:a6:c8:0a:5b:95
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.5.0-17-generic firmware=18.168.6.1 ip=192.168.0.15 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:45 memory:f7c00000-f7c01fff
*-network
description: Ethernet interface
product: RTL8111/8168B PCI Express Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 07
serial: 4c:72:b9:e3:62:95
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:42 ioport:e000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff

Have tried

sudo modprobe -r iwlwifi 
sudo modprobe iwlwifi 11n_disable=1

Unfortunately no effect.

As part of of my investigations I have noticed that although distance makes the problem more frequent and longer lasting the speed will still drop to <~ 1Mb/s even when very close to the router.

And on that point to clarify observed behaviour, sometimes it will be running at normalish speeds then all of a sudden drop to <~ 1Mb/s.


Update:

Have tried

sudo modprobe -r iwlwifi sudo modprobe iwlwifi 11n_disable=1

Unfortunately no effect.

As part of of my investigations I have noticed that although distance makes the problem more frequent and longer lasting the speed will still drop to <~ 1Mb/s even when very close to the router.

And on that point to clarify observed behaviour, sometimes it will be running at normalish speeds then all of a sudden drop to <~ 1Mb/s.

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Cannot format comment –  slipp3ry Nov 1 '12 at 19:57
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