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[Pjotr12345 <computertip@xxxxxxxxx>]

OK, this appears to be an effective workaround: disable power management
for the wireless chipset. As follows:

Applications - Accessories - Terminal
type (use copy/paste): 
gksudo gedit /etc/rc.local

Press Enter.

Add this line, just above exit 0 (use copy/paste):
iwconfig wlan0 power off

So it should become something like this (example):

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
iwconfig wlan0 power off
exit 0

Save, close and reboot. The problem should be fixed permanently.

Please report your findings.


** Tags added: lucid

** Description changed:

+ Added description:
+ 
+ This bug is still present in 10.04 Lucid Lynx. In comment #161 I've
+ described a workaround that should be effective, at least in Lucid.
+ 
+ ----------------
  Binary package hint: linux-ubuntu-modules-2.6.24-8-generic
  
  I'm using hardy alpha 4 (on Linux nand-laptop 2.6.24-5-generic #1 SMP Thu Jan 24 19:45:21 UTC 2008 i686 GNU/Linux ) and I was testing a PCMCIA rt2500 card :
-  03:00.0 Network controller [0280]: RaLink RT2500 802.11g Cardbus/mini-PCI [1814:0201] (rev 01)
+  03:00.0 Network controller [0280]: RaLink RT2500 802.11g Cardbus/mini-PCI [1814:0201] (rev 01)
  with WEP encryption, near the AP :
- wlan0     IEEE 802.11g  ESSID:"DartyBox_005c"  
-           Mode:Managed  Frequency:2.462 GHz  Access Point: 00:09:5B:EB:32:20   
-           Bit Rate=1 Mb/s   Tx-Power=27 dBm   
-           Retry min limit:7   RTS thr:off   Fragment thr=2346 B   
-           Link Quality=43/100  Signal level=-54 dBm  
-           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
-           Tx excessive retries:0  Invalid misc:0   Missed beacon:0
+ wlan0     IEEE 802.11g  ESSID:"DartyBox_005c"
+           Mode:Managed  Frequency:2.462 GHz  Access Point: 00:09:5B:EB:32:20
+           Bit Rate=1 Mb/s   Tx-Power=27 dBm
+           Retry min limit:7   RTS thr:off   Fragment thr=2346 B
+           Link Quality=43/100  Signal level=-54 dBm
+           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
+           Tx excessive retries:0  Invalid misc:0   Missed beacon:0
  
- 
- The connection is working, but slowly (40 kb/s). It's due to the bit rate being set to 1Mb/s. If I manually set the rate to 54Mb/s, then I got the 900 kb/s I expect from my AP.
+ The connection is working, but slowly (40 kb/s). It's due to the bit
+ rate being set to 1Mb/s. If I manually set the rate to 54Mb/s, then I
+ got the 900 kb/s I expect from my AP.
  
  I have also tested with one other RT based I have, a RT73 one, and the
  bit rate goes automatically to 54Mb/s...

** Description changed:

- Added description:
+ Added description on June, 4th 2010:
  
  This bug is still present in 10.04 Lucid Lynx. In comment #161 I've
  described a workaround that should be effective, at least in Lucid.
+ 
+ --Pjotr12345
  
  ----------------
  Binary package hint: linux-ubuntu-modules-2.6.24-8-generic
  
  I'm using hardy alpha 4 (on Linux nand-laptop 2.6.24-5-generic #1 SMP Thu Jan 24 19:45:21 UTC 2008 i686 GNU/Linux ) and I was testing a PCMCIA rt2500 card :
   03:00.0 Network controller [0280]: RaLink RT2500 802.11g Cardbus/mini-PCI [1814:0201] (rev 01)
  with WEP encryption, near the AP :
  wlan0     IEEE 802.11g  ESSID:"DartyBox_005c"
            Mode:Managed  Frequency:2.462 GHz  Access Point: 00:09:5B:EB:32:20
            Bit Rate=1 Mb/s   Tx-Power=27 dBm
            Retry min limit:7   RTS thr:off   Fragment thr=2346 B
            Link Quality=43/100  Signal level=-54 dBm
            Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
            Tx excessive retries:0  Invalid misc:0   Missed beacon:0
  
  The connection is working, but slowly (40 kb/s). It's due to the bit
  rate being set to 1Mb/s. If I manually set the rate to 54Mb/s, then I
  got the 900 kb/s I expect from my AP.
  
  I have also tested with one other RT based I have, a RT73 one, and the
  bit rate goes automatically to 54Mb/s...

-- 
[Hardy][Intrepid] Low bandwidth with rt2400 / rt2500 drivers
https://bugs.launchpad.net/bugs/190515
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Administrators, which is the registrant for rt2x00 Project.