I recently installed Ubuntu 12.04 LTS with all the updates. I have an external wireless card with a rtl8187b chipset. I discovered that the card manages to transfer at full speed after for a bit, but slows down again after a minute or so. I've already faced this problem in Ubuntu 11.04 and 11.10.
dan@ubuntu:~$ uname -a
Linux ubuntu 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 UTC 2012 i686 i686 i386 GNU/Linux
dan@ubuntu:~$ modprobe --show-depends rtl8187
insmod /lib/modules/3.2.0-24-generic-pae/kernel/drivers/misc/eeprom/eeprom_93cx6.ko
insmod /lib/modules/3.2.0-24-generic-pae/kernel/net/wireless/cfg80211.ko
insmod /lib/modules/3.2.0-24-generic-pae/kernel/net/mac80211/mac80211.ko
insmod /lib/modules/3.2.0-24-generic-pae/kernel/drivers/net/wireless/rtl818x/rtl8187/rtl8187.ko
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-24-generic-pae 3.2.0-24.37
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
Uname: Linux 3.2.0-24-generic-pae i686
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: dan 1463 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xe8280000 irq 45'
Mixer name : 'Analog Devices AD1984A'
Components : 'HDA:11d4194a,103c3632,00100400'
Controls : 18
Simple ctrls : 11
Date: Sun May 6 15:45:56 2012
HibernationDevice: RESUME=UUID=8da25f7f-ed90-4ad4-b31a-721e1f9a5cff
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MachineType: Hewlett-Packard HP Mini 5101
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic-pae root=UUID=057c27c4-09aa-4c3b-94b1-80113e95c983 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-24-generic-pae N/A
linux-backports-modules-3.2.0-24-generic-pae N/A
linux-firmware 1.79
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/06/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68DGI Ver. F.01
dmi.board.name: 3632
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 34.0F
dmi.chassis.asset.tag: CNU934B5WF
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68DGIVer.F.01:bd07/06/2009:svnHewlett-Packard:pnHPMini5101:pvrF.01:rvnHewlett-Packard:rn3632:rvrKBCVersion34.0F:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Mini 5101
dmi.product.version: F.01
dmi.sys.vendor: Hewlett-Packard
Dany K, thank you for reporting this and helping make Ubuntu better. Unfortunately, we cannot work on this bug because your description didn't include enough information. You may find it helpful to read "How to report bugs effectively" http://
We have instructions on debugging some types of problems at http://
At a minimum, we need:
1. the specific steps or actions you took that caused you to encounter the problem,
2. the behavior you expected, and
3. the behavior you actually encountered (in as much detail as possible).
If you could also please test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https:/
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-
If the mainline kernel does not fix this bug, please add the tag: 'kernel-
If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-
Please let us know your results. Thanks in advance.