[1] Summary of Problem.
0bda:8176 RTL8188CUS does not connect to wireless networks
[2] Full description of the Problem.
The RTL8188CUS USB wireless card will not connect to wireless networks. The connection is attempted over and over again, and the password prompt reappears each time if the network has one, but a connection is never established.
There is a workaround for this bug: Drivers can be obtained from the Realtek website. But they are required in order for the hardware to function properly.
[3] Keywords. (I have no idea what these are so I did my best)
wireless, rtl8192CU, rtlwifi, rtl8192cu_common, RTL8188CUS, kernel, upstream
[4] Kernel version.
`cat /proc/version'
Linux version 3.6.0-030600rc1-generic (apw@gomeisa) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201208022056 SMP Fri Aug 3 01:04:00 UTC 2012
[5] Not a kernel oops.
[6] Not applicable.
[7] Environment.
`lsb_release -rd'
Description: Ubuntu 12.04 LTS
Release: 12.04
[7.1] Software.
`sh /usr/src/linux-headers-3.6.0-030600rc1/scripts/ver_linux'
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
Linux richie-abacus 3.6.0-030600rc1-generic #201208022056 SMP Fri Aug 3 01:04:00 UTC 2012 i686 i686 i386 GNU/Linux
Gnu C 4.6
Gnu make 3.81
binutils 2.22
util-linux 2.20.1
mount support
module-init-tools 3.16
e2fsprogs 1.42
Linux C Library 2.15
Dynamic linker (ldd) 2.15
Procps 3.2.8
Net-tools 1.60
Kbd 1.15.2
Sh-utils 8.13
wireless-tools 30
Modules Loaded arc4 rtl8192cu rtl8192c_common rtlwifi mac80211 cfg80211 nls_iso8859_1 bnep rfcomm bluetooth dm_crypt snd_maestro3 snd_ac97_codec xircom_cb ac97_bus snd_pcm joydev snd_page_alloc snd_seq_midi ppdev snd_rawmidi snd_seq_midi_event snd_seq dell_laptop snd_timer snd_seq_device dcdbas snd psmouse pcmcia microcode serio_raw mac_hid i2c_piix4 yenta_socket soundcore pcmcia_rsrc shpchp pcmcia_core parport_pc lp parport video floppy usb_storage
[7.2] Processor information.
`cat /proc/cpuinfo'
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 3
microcode : 0x8
cpu MHz : 647.188
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pse36 mmx fxsr sse up
bogomips : 1294.37
clflush size : 32
cache_alignment : 32
address sizes : 36 bits physical, 32 bits virtual
power management:
[7.3] Module information.
`cat /proc/modules'
arc4 12509 2 - Live 0x00000000
rtl8192cu 67453 0 - Live 0x00000000
rtl8192c_common 47695 1 rtl8192cu, Live 0x00000000
rtlwifi 65237 1 rtl8192cu, Live 0x00000000
mac80211 480685 3 rtl8192cu,rtl8192c_common,rtlwifi, Live 0x00000000
cfg80211 185470 2 rtlwifi,mac80211, Live 0x00000000
nls_iso8859_1 12617 0 - Live 0x00000000
bnep 17850 2 - Live 0x00000000
rfcomm 38400 0 - Live 0x00000000
bluetooth 191687 8 bnep,rfcomm, Live 0x00000000
dm_crypt 22564 0 - Live 0x00000000
snd_maestro3 23086 2 - Live 0x00000000
snd_ac97_codec 106082 1 snd_maestro3, Live 0x00000000
xircom_cb 17393 0 - Live 0x00000000
ac97_bus 12670 1 snd_ac97_codec, Live 0x00000000
snd_pcm 81246 2 snd_maestro3,snd_ac97_codec, Live 0x00000000
joydev 17393 0 - Live 0x00000000
snd_page_alloc 14108 1 snd_pcm, Live 0x00000000
snd_seq_midi 13132 0 - Live 0x00000000
ppdev 12849 0 - Live 0x00000000
snd_rawmidi 25425 1 snd_seq_midi, Live 0x00000000
snd_seq_midi_event 14475 1 snd_seq_midi, Live 0x00000000
snd_seq 51568 2 snd_seq_midi,snd_seq_midi_event, Live 0x00000000
dell_laptop 17209 0 - Live 0x00000000
snd_timer 28931 2 snd_pcm,snd_seq, Live 0x00000000
snd_seq_device 14137 3 snd_seq_midi,snd_rawmidi,snd_seq, Live 0x00000000
dcdbas 14098 1 dell_laptop, Live 0x00000000
snd 62520 11 snd_maestro3,snd_ac97_codec,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device, Live 0x00000000
psmouse 77485 0 - Live 0x00000000
pcmcia 39819 0 - Live 0x00000000
microcode 18406 0 - Live 0x00000000
serio_raw 13031 0 - Live 0x00000000
mac_hid 13077 0 - Live 0x00000000
i2c_piix4 13264 0 - Live 0x00000000
yenta_socket 27464 0 - Live 0x00000000
soundcore 14635 1 snd, Live 0x00000000
pcmcia_rsrc 18367 1 yenta_socket, Live 0x00000000
shpchp 32325 0 - Live 0x00000000
pcmcia_core 21511 3 pcmcia,yenta_socket,pcmcia_rsrc, Live 0x00000000
parport_pc 32114 1 - Live 0x00000000
lp 17455 0 - Live 0x00000000
parport 40930 3 ppdev,parport_pc,lp, Live 0x00000000
video 18908 0 - Live 0x00000000
floppy 60213 0 - Live 0x00000000
usb_storage 39719 0 - Live 0x00000000
[7.4] Loaded driver and hardware information.
`cat /proc/ioports'
0000-001f : dma1
0020-0021 : pic1
0022-0022 : ACPI PM2_CNT_BLK
0040-0043 : timer0
0050-0053 : timer1
0060-0060 : keyboard
0064-0064 : keyboard
0070-0071 : rtc0
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : 0000:00:07.1
0170-0177 : ata_piix
01f0-01f7 : 0000:00:07.1
01f0-01f7 : ata_piix
0376-0376 : 0000:00:07.1
0376-0376 : ata_piix
0378-037a : parport0
03f0-03f1 : pnp 00:09
03f2-03f2 : floppy
03f4-03f5 : floppy
03f6-03f6 : 0000:00:07.1
03f6-03f6 : ata_piix
03f7-03f7 : floppy
03f8-03ff : serial
04d0-04d1 : pnp 00:02
0778-077a : parport0
0800-083f : 0000:00:07.3
0800-0803 : ACPI PM1a_EVT_BLK
0808-080b : ACPI PM_TMR
080c-080f : ACPI GPE0_BLK
0810-0815 : ACPI CPU throttle
0840-084f : 0000:00:07.3
0840-084f : pnp 00:03
0840-0847 : piix4_smbus
0850-0853 : pnp 00:03
0854-0855 : pnp 00:02
0854-0855 : ACPI PM1a_CNT_BLK
0856-085f : pnp 00:03
0860-086f : 0000:00:07.1
0860-086f : ata_piix
0a00-0a7f : pnp 00:03
0a80-0aff : pnp 00:03
0cf8-0cff : PCI conf1
1000-10ff : PCI CardBus 0000:02
1000-107f : 0000:02:00.0
1000-107f : xircom_cb
1080-1087 : 0000:02:00.1
1080-1087 : serial
1400-14ff : PCI CardBus 0000:02
1800-18ff : PCI CardBus 0000:06
1c00-1cff : PCI CardBus 0000:06
d800-d8ff : 0000:00:08.0
d800-d8ff : Maestro3
dce0-dcff : 0000:00:07.2
dce0-dcff : uhci_hcd
e000-efff : PCI Bus 0000:01
ec00-ecff : 0000:01:00.0
f400-f4fe : pnp 00:04
`cat /proc/iomem'
00000000-0000ffff : reserved
00010000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000cffff : Video ROM
000c0000-000cbfff : reserved
000f0000-000fffff : System ROM
00100000-0ffebfff : System RAM
01000000-015e9860 : Kernel code
015e9861-018d763f : Kernel data
0199c000-01a74fff : Kernel bss
0ffec000-0ffeffff : reserved
0fff0000-0fffffff : RAM buffer
100a0000-100fffff : reserved
10100000-101fffff : PCI Bus 0000:01
10100000-1011ffff : 0000:01:00.0
14000000-14000fff : 0000:00:03.0
14000000-14000fff : yenta_socket
18000000-1bffffff : PCI CardBus 0000:02
18000000-18003fff : 0000:02:00.0
18004000-18007fff : 0000:02:00.1
1c000000-1fffffff : PCI CardBus 0000:02
1c000000-1c0007ff : 0000:02:00.0
1c000000-1c0007ff : xircom_cb
1c000800-1c000fff : 0000:02:00.0
1c000800-1c000fff : xircom_cb
1c001000-1c0017ff : 0000:02:00.1
1c001800-1c001fff : 0000:02:00.1
20000000-20000fff : 0000:00:03.1
20000000-20000fff : yenta_socket
24000000-27ffffff : PCI CardBus 0000:06
28000000-2bffffff : PCI CardBus 0000:06
ed000000-edffffff : pnp 00:04
f4000000-f7ffffff : 0000:00:00.0
faffe000-faffffff : 0000:00:08.0
faffe000-faffffff : Maestro3
fc000000-feffffff : PCI Bus 0000:01
fcfff000-fcffffff : 0000:01:00.0
fd000000-fdffffff : 0000:01:00.0
ffe00000-ffffffff : reserved
ffe00000-ffffffff : pnp 00:00
[7.5] PCI information.
`sudo lspci -vvv'
00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (rev 03)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
Latency: 32
Region 0: Memory at f4000000 (32-bit, prefetchable) [size=64M]
Capabilities: [a0] AGP version 1.0
Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
Kernel driver in use: agpgart-intel
00:01.0 PCI bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX AGP bridge (rev 03) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 32
Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
I/O behind bridge: 0000e000-0000efff
Memory behind bridge: fc000000-feffffff
Prefetchable memory behind bridge: 10100000-101fffff
Secondary status: 66MHz+ FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B+
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Kernel modules: shpchp
00:03.0 CardBus bridge: Texas Instruments PCI1225 (rev 01)
Subsystem: Dell Device 00bb
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 168, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 11
Region 0: Memory at 14000000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=00, secondary=02, subordinate=05, sec-latency=176
Memory window 0: 18000000-1bfff000 (prefetchable)
Memory window 1: 1c000000-1ffff000
I/O window 0: 00001000-000010ff
I/O window 1: 00001400-000014ff
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt- PostWrite+
16-bit legacy interface ports at 0001
Kernel driver in use: yenta_cardbus
Kernel modules: yenta_socket
00:03.1 CardBus bridge: Texas Instruments PCI1225 (rev 01)
Subsystem: Dell Device 00bb
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 168, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 11
Region 0: Memory at 20000000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=00, secondary=06, subordinate=09, sec-latency=176
Memory window 0: 24000000-27fff000 (prefetchable)
Memory window 1: 28000000-2bfff000
I/O window 0: 00001800-000018ff
I/O window 1: 00001c00-00001cff
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
16-bit legacy interface ports at 0001
Kernel driver in use: yenta_cardbus
Kernel modules: yenta_socket
00:07.0 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01) (prog-if 80 [Master])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 32
Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1]
Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
Region 4: I/O ports at 0860 [size=16]
Kernel driver in use: ata_piix
00:07.2 USB controller: Intel Corporation 82371AB/EB/MB PIIX4 USB (rev 01) (prog-if 00 [UHCI])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 32
Interrupt: pin D routed to IRQ 11
Region 4: I/O ports at dce0 [size=32]
Kernel driver in use: uhci_hcd
00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin ? routed to IRQ 9
Kernel driver in use: piix4_smbus
Kernel modules: i2c-piix4
00:08.0 Multimedia audio controller: ESS Technology ES1983S Maestro-3i PCI Audio Accelerator (rev 10)
Subsystem: Dell Device 00bb
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 32 (500ns min, 6000ns max)
Interrupt: pin A routed to IRQ 5
Region 0: I/O ports at d800 [size=256]
Region 1: Memory at faffe000 (32-bit, non-prefetchable) [size=8K]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Kernel driver in use: snd_maestro3
Kernel modules: snd-maestro3
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Rage Mobility P/M AGP 2x (rev 64) (prog-if 00 [VGA controller])
Subsystem: Dell Latitude CPx
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 32 (2000ns min), Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 11
Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
Region 1: I/O ports at ec00 [size=256]
Region 2: Memory at fcfff000 (32-bit, non-prefetchable) [size=4K]
[virtual] Expansion ROM at 10100000 [disabled] [size=128K]
Capabilities: [50] AGP version 1.0
Status: RQ=256 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
Capabilities: [5c] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Kernel modules: atyfb
02:00.0 Ethernet controller: Xircom Cardbus Ethernet 10/100 (rev 03)
Subsystem: Xircom Cardbus Ethernet 10/100
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 64 (5000ns min, 10000ns max), Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 1000 [size=128]
Region 1: Memory at 1c000000 (32-bit, non-prefetchable) [size=2K]
Region 2: Memory at 1c000800 (32-bit, non-prefetchable) [size=2K]
[virtual] Expansion ROM at 18000000 [disabled] [size=16K]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=2 PME-
Kernel driver in use: xircom_cb
Kernel modules: xircom_cb
02:00.1 Serial controller: Xircom Cardbus Ethernet + 56k Modem (rev 03) (prog-if 02 [16550])
Subsystem: Xircom CBEM56G-100 Ethernet + 56k Modem
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 1080 [size=8]
Region 1: Memory at 1c001000 (32-bit, non-prefetchable) [size=2K]
Region 2: Memory at 1c001800 (32-bit, non-prefetchable) [size=2K]
[virtual] Expansion ROM at 18004000 [disabled] [size=16K]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=2 PME-
Kernel driver in use: serial
[7.6] SCSI information.
`cat /proc/scsi/scsi'
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: FUJITSU MHK2120A Rev: D834
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: SAMSUNG Model: CD-ROM SN-124 Rev: S004
Type: CD-ROM ANSI SCSI revision: 05
[7.7] '/proc' contents.
`ls /proc'
1 1161 19 370 8 buddyinfo key-users softirqs
10 1167 2 38 815 bus kmsg stat
1065 1170 20 39 816 cgroups kpagecount swaps
1092 1171 21 41 854 cmdline kpageflags sys
1095 1175 22 42 889 consoles latency_stats sysrq-trigger
1096 1178 23 5 893 cpuinfo loadavg sysvipc
11 1179 23554 504 894 crypto locks timer_list
1101 12 23567 517 9 devices mdstat timer_stats
1107 123 23589 526 907 diskstats meminfo tty
1110 1298 23593 606 928 dma misc uptime
1111 13 23601 61 936 driver modules version
1114 1355 237 62 941 execdomains mounts vmallocinfo
1116 14 238 63 942 fb mtrr vmstat
1118 1493 24 64 943 filesystems net zoneinfo
1123 1494 25 697 949 fs pagetypeinfo
1132 1495 258 7 955 interrupts partitions
1134 15 26 772 980 iomem sched_debug
1138 16 27 777 984 ioports schedstat
1140 17 3 791 990 irq scsi
1143 1710 339 793 acpi kallsyms self
1144 1726 36 798 asound kcore slabinfo
On 08/15/2012 10:22 PM, Richie Gress wrote:
> [1] Summary of Problem.
> 0bda:8176 RTL8188CUS does not connect to wireless networks
>
> [2] Full description of the Problem.
> The RTL8188CUS USB wireless card will not connect to wireless networks. The connection is attempted over and over again, and the password prompt reappears each time if the network has one, but a connection is never established.
> There is a workaround for this bug: Drivers can be obtained from the Realtek website. But they are required in order for the hardware to function properly.
You gave quite a complete report, but you missed some important factors. What
kind of wireless connection are you trying to make (802.11n, 802.11g, etc)? What
kind of encryption? What is the make/model of the AP?
My tests show that rtl8192cu can make a connection for 802.11n and 802.11g, as
long as the encryption is WPA2. With WPA or WEP encryption, an 802.11g
connection fails as you describe.
I am now checking to see where this regression occurred. Please fill out a
kernel bugzilla on this regression, and assign it to me.
Thanks,
Larry