I have permament problem when using WLAN with my Lenovo ThinkPad x121e. The wireless network adapter in use is this one:
lspci:
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
The connection normally works OK for some time and then starts to slow down and eventually disconnects. Sometimes the connection is reestablished seconds later, sometimes it takes 30 or more seconds, sometimes it does not reconnect at all.
This problem occures with every driver I tried up to now. Especially the kernel driver
Linux ThinkPad 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21 20:28:43 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
and Realteks driver that can be found here. The driver I'm using at the moment is the one found in this ppa: ppa:tista/x120e
.
Here is another link to www.thinkwiki.org that hints at a "Low Power State" (LPS) option in realtek's driver but it seems that it cannot be disabled in the current driver.
Is there a way to get a more stable WLAN with this setup?
Some more system information:
lshw -class network:
description: Wireless interface
product: RTL8188CE 802.11b/g/n WiFi Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:01:00.0
logical name: wlan0
version: 01
serial: 38:59:f9:db:e6:83
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8192CE driverversion=0006.0321.2011 firmware=56 ip=192.168.178.35 latency=0 link=yes multicast=yes wireless=802.11bgn
resources: irq:17 ioport:3000(size=256) memory:f0200000-f0203fff
iwconfig wlan0:
wlan0 802.11bgn ESSID:"xxx" Nickname:"rtl8192CE"
Mode:Managed Frequency=2.452 GHz Access Point: A2:05:43:2F:6E:8E
Bit Rate=65 Mb/s
Retry:on RTS thr:off Fragment thr:off
Power Management period:0us mode:All packets received
Link Quality=100/100 Signal level=0 dBm Noise level=-120 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
ifconfig wlan:
wlan0 Link encap:Ethernet HWaddr 38:59:f9:db:e6:83
inet addr:192.168.178.35 Bcast:192.168.178.255 Mask:255.255.255.0
inet6 addr: fe80::3a59:f9ff:fedb:e683/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:117385 errors:0 dropped:0 overruns:0 frame:0
TX packets:85652 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:115417879 (115.4 MB) TX bytes:10463799 (10.4 MB)
Interrupt:17 Memory:ffffc900037a8000-ffffc900037a8100