I'm having this issue as well. Connection is intermittent with model
RTL8192CU (Belkin n300 nano). It works sometimes but it's slow to
connect and it takes a while to connect.

➜  ~  lsusb
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 003 Device 002: ID 050d:2103 Belkin Components F7D2102 802.11n N300 Micro 
Wireless Adapter v3000 [Realtek RTL8192CU]
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0bda:5705 Realtek Semiconductor Corp. 
Bus 001 Device 006: ID 03eb:880a Atmel Corp. 


➜  ~  uname -a
Linux chris-S500CA 3.8.0-22-generic #33-Ubuntu SMP Thu May 16 15:17:14 UTC 2013 
x86_64 x86_64 x86_64 GNU/Linux

➜  ~  tail /var/log/dmesg
[   19.832892] type=1400 audit(1369952938.532:7): apparmor="STATUS" 
operation="profile_load" 
name="/usr/lib/x86_64-linux-gnu/lightdm-remote-session-freerdp/freerdp-session-wrapper"
 pid=1222 comm="apparmor_parser"
[   19.833222] type=1400 audit(1369952938.536:8): apparmor="STATUS" 
operation="profile_load" 
name="/usr/lib/x86_64-linux-gnu/lightdm-remote-session-freerdp/freerdp-session-wrapper//chromium_browser"
 pid=1222 comm="apparmor_parser"
[   19.833580] type=1400 audit(1369952938.536:9): apparmor="STATUS" 
operation="profile_load" 
name="/usr/lib/lightdm/lightdm/lightdm-guest-session-wrapper" pid=1221 
comm="apparmor_parser"
[   19.833703] type=1400 audit(1369952938.536:10): apparmor="STATUS" 
operation="profile_load" 
name="/usr/lib/x86_64-linux-gnu/lightdm-remote-session-uccsconfigure/uccsconfigure-session-wrapper"
 pid=1223 comm="apparmor_parser"
[   19.833909] type=1400 audit(1369952938.536:11): apparmor="STATUS" 
operation="profile_load" 
name="/usr/lib/lightdm/lightdm/lightdm-guest-session-wrapper//chromium_browser" 
pid=1221 comm="apparmor_parser"
[   19.834032] type=1400 audit(1369952938.536:12): apparmor="STATUS" 
operation="profile_load" 
name="/usr/lib/x86_64-linux-gnu/lightdm-remote-session-uccsconfigure/uccsconfigure-session-wrapper//chromium_browser"
 pid=1223 comm="apparmor_parser"
[   19.835481] type=1400 audit(1369952938.536:13): apparmor="STATUS" 
operation="profile_replace" name="/sbin/dhclient" pid=1224 
comm="apparmor_parser"
[   19.835918] type=1400 audit(1369952938.536:14): apparmor="STATUS" 
operation="profile_replace" 
name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=1224 
comm="apparmor_parser"
[   19.836161] type=1400 audit(1369952938.536:15): apparmor="STATUS" 
operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" 
pid=1224 comm="apparmor_parser"
[   19.838041] type=1400 audit(1369952938.540:16): apparmor="STATUS" 
operation="profile_load" name="/usr/lib/telepathy/mission-control-5" pid=1227 
comm="apparmor_parser"

➜  ~  tail /var/log/syslog 
May 30 19:36:11 chris-S500CA kernel: [ 1448.688383] cfg80211:   (2402000 KHz - 
2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm)
May 30 19:36:11 chris-S500CA kernel: [ 1448.688388] cfg80211:   (5170000 KHz - 
5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
May 30 19:36:11 chris-S500CA kernel: [ 1448.688391] cfg80211:   (5250000 KHz - 
5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 30 19:36:11 chris-S500CA kernel: [ 1448.688395] cfg80211:   (5490000 KHz - 
5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 30 19:36:11 chris-S500CA kernel: [ 1448.688399] cfg80211:   (5650000 KHz - 
5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
May 30 19:36:11 chris-S500CA kernel: [ 1448.688402] cfg80211:   (5735000 KHz - 
5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
May 30 19:36:11 chris-S500CA wpa_supplicant[1165]: wlan2: WPA: Key negotiation 
completed with 00:7f:28:4f:79:06 [PTK=CCMP GTK=CCMP]
May 30 19:36:11 chris-S500CA wpa_supplicant[1165]: wlan2: CTRL-EVENT-CONNECTED 
- Connection to 00:7f:28:4f:79:06 completed (reauth) [id=0 id_str=]
May 30 19:36:11 chris-S500CA NetworkManager[1146]: <info> (wlan2): supplicant 
interface state: associated -> completed
May 30 19:36:11 chris-S500CA NetworkManager[1146]: <info> (wlan2): roamed from 
BSSID (none) ((none)) to 00:7F:28:4F:79:06 (D2LD9)

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https://bugs.launchpad.net/bugs/1132381

Title:
  rtl8192cu drivers very low dl-speed

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