Wireless connection is slow and unstable

[SnuffLord]

Hello! I am currently running Linux Mint 12 64 bits, on a Clevo W150HRM laptop, and I am facing issues regarding my wireless connection. Not only it is very slow, much slower than it should be (a few kb/s on a broadband connection), but it also disconnects from time to time. Sometimes, when it disconnects, I cannot reconnect again without rebooting the system. On Windows this problem do not shows up.

Any help regarding this situation would be very appreciated. Thank you very much in advance

Here follows the output of mintwifi:

-------------------------
* I. scanning WIFI PCI devices...
-- Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
==> PCI ID = 10ec:8176 (rev 01)
-------------------------
* II. querying ndiswrapper...
-------------------------
* III. querying iwconfig...
lo no wireless extensions.

eth0 no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:"Vodafone-563483"
Mode:Managed Frequency:2.462 GHz Access Point: 58:98:35:56:34:83
Bit Rate=65 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr=2347 B Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=30/70 Signal level=-80 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

-------------------------
* IV. querying ifconfig...
eth0 Link encap:Ethernet HWaddr 00:90:f5:be:60:0e
UP BROADCAST RUNNING 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)
Interrupt:54

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:156 errors:0 dropped:0 overruns:0 frame:0
TX packets:156 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:11712 (11.7 KB) TX bytes:11712 (11.7 KB)

wlan0 Link encap:Ethernet HWaddr e0:b9:a5:b3:4e:27
inet addr:192.168.1.68 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::e2b9:a5ff:feb3:4e27/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:15627 errors:0 dropped:0 overruns:0 frame:0
TX packets:15172 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15114563 (15.1 MB) TX bytes:2874143 (2.8 MB)

-------------------------
* V. querying DHCP...
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service smbd reload

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the reload(8) utility, e.g. reload smbd
-------------------------
* VI. querying nslookup google.com...
Server: 192.168.1.254
Address: 192.168.1.254#53

Non-authoritative answer:
Name: google.com
Address: 173.194.34.233
Name: google.com
Address: 173.194.34.238
Name: google.com
Address: 173.194.34.224
Name: google.com
Address: 173.194.34.225
Name: google.com
Address: 173.194.34.226
Name: google.com
Address: 173.194.34.227
Name: google.com
Address: 173.194.34.228
Name: google.com
Address: 173.194.34.229
Name: google.com
Address: 173.194.34.230
Name: google.com
Address: 173.194.34.231
Name: google.com
Address: 173.194.34.232

[jimzhong]

It seems the signal is rather weak. I assume that is why your connection is slow.

[SnuffLord]

The point is: this happens even if I am sitting by the router. And that 'weak signal' thing only happens on Linux Mint. If i reboot on M. Windows, it works just fine.

[jimzhong]

Have you installed the wireless driver from Realtek?
If not, go to http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=21&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false and find the driver.
And this page http://www.chayx.net/2011/06/how-to-install-realtek-rtl8188ce-wifi-drivers-thinkpad-edge-13-on-ubuntu-natty-1104.html may help.
You can also try compat-wireless if the one from Realtek doesn't work.