Comment 5 for bug 132042

Hi, I have exactly the same issue. It can vary in degree of frequency. However, the longer the machine is on, then the more chance of wireless stopping, and a reboot is needed to get wireless back up.

Issuing:
sudo iwlist wlan0 scan

Will result in the message "No scan results"

No matter how many times sudo ifdown wlan0/sudo ifup wlan0 command combination is issued, the iwlist reports no AP's to associate with. Nothing reported using iwevent either.

Also: sudo /etc/init.d/networking restart - doesn't fair any better either.

Upon which, I am forced to reboot to get wireless netwoking back.

I'm currently using 64bit WEP encryption.

Here's some info:

System:
Feisty Fawn 7.04

"uname -a" output:
2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686 GNU/Linux

Network Adapter:
Realtek RTL 8187 USB2.0 (Integrated) device ID: 0bda:8187

"lsusb" output:

Bus 005 Device 004: ID 0402:5602 ALi Corp.
Bus 005 Device 002: ID 0bda:8187 Realtek Semiconductor Corp.
Bus 005 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
Bus 002 Device 003: ID 1020:0206 Labtec
Bus 002 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000

"lsmod" output:

Module Size Used by
binfmt_misc 12680 1
vboxdrv 44552 0
ppdev 10116 0
i915 24448 2
drm 81044 3 i915
dev_acpi 12292 0
tc1100_wmi 8068 0
pcc_acpi 13184 0
sony_acpi 6284 0
button 8720 0
ac 6020 0
sbs 15652 0
i2c_ec 6016 1 sbs
i2c_core 22656 1 i2c_ec
container 5248 0
battery 10756 0
acpi_cpufreq 10056 1
dock 10268 0
video 16388 0
asus_acpi 17308 0
backlight 7040 1 asus_acpi
cpufreq_conservative 8200 0
cpufreq_ondemand 9228 2
cpufreq_powersave 2688 0
cpufreq_stats 7360 0
freq_table 5792 3 acpi_cpufreq,cpufreq_ondemand,cpufreq_stats
cpufreq_userspace 5408 0
rt2570 187072 0
sbp2 23812 0
parport_pc 36388 0
lp 12452 0
parport 36936 3 ppdev,parport_pc,lp
fuse 46612 1
arc4 2944 2
ecb 4480 2
blkcipher 6784 1 ecb
rc80211_simple 6400 1
snd_hda_intel 21912 4
snd_hda_codec 205056 1 snd_hda_intel
snd_pcm_oss 44544 0
snd_pcm 79876 4 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_mixer_oss 17408 1 snd_pcm_oss
rtl8187 34944 0
mac80211 175364 2 rc80211_simple,rtl8187
snd_seq_dummy 4740 0
pcmcia 39212 0
cfg80211 22920 1 mac80211
snd_seq_oss 32896 0
usbhid 26592 0
hid 27392 1 usbhid
eeprom_93cx6 4352 1 rtl8187
snd_seq_midi 9600 0
snd_rawmidi 25472 1 snd_seq_midi
snd_seq_midi_event 8448 2 snd_seq_oss,snd_seq_midi
snd_seq 52592 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer 23684 3 snd_pcm,snd_seq
snd_seq_device 9100 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
snd 54020 16 snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_pcm,snd_mixer_oss,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
serio_raw 7940 0
iTCO_wdt 11812 0
iTCO_vendor_support 4868 1 iTCO_wdt
soundcore 8672 1 snd
snd_page_alloc 10888 2 snd_hda_intel,snd_pcm
yenta_socket 27532 1
rsrc_nonstatic 14080 1 yenta_socket
sdhci 18700 0
mmc_core 26756 1 sdhci
tifm_7xx1 8704 0
tifm_core 11140 1 tifm_7xx1
pcmcia_core 40852 3 pcmcia,yenta_socket,rsrc_nonstatic
psmouse 38920 0
intel_agp 25244 1
agpgart 35400 3 drm,intel_agp
af_packet 23816 12
shpchp 34324 0
pci_hotplug 32576 1 shpchp
tsdev 8768 0
evdev 11008 5
ext3 133128 1
jbd 59816 1 ext3
mbcache 9604 1 ext3
sg 36252 0
sr_mod 17060 0
cdrom 37664 1 sr_mod
sd_mod 23428 3
ata_generic 9092 0
ata_piix 15492 2
libata 125720 2 ata_generic,ata_piix
scsi_mod 142348 5 sbp2,sg,sr_mod,sd_mod,libata
r8169 32392 0
ohci1394 36528 0
ieee1394 299448 2 sbp2,ohci1394
generic 5124 0 [permanent]
ehci_hcd 34188 0
uhci_hcd 25360 0
usbcore 134280 6 rt2570,rtl8187,usbhid,ehci_hcd,uhci_hcd
thermal 14856 0
processor 31048 2 acpi_cpufreq,thermal
fan 5636 0
fbcon 42656 0
tileblit 3584 1 fbcon
font 9216 1 fbcon
bitblit 6912 1 fbcon
softcursor 3200 1 bitblit
vesafb 9220 0
capability 5896 0
commoncap 8192 1 capability

"lspci" output:

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02)
05:07.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
05:07.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE 1394 Host Controller
05:07.2 Mass storage controller: Texas Instruments 5-in-1 Multimedia Card Reader (SD/MMC/MS/MS PRO/xD)
05:07.3 Generic system peripheral [0805]: Texas Instruments PCIxx12 SDA Standard Compliant SD Host Controller
05:0b.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10)

In addition, i have an external Dlink DWL-G122 USB adapter, which this issue also occurs with.