0586:341f rtl8192cu drivers very low dl-ul-speed

[panmari]

With the kernel drivers, my device based on the rtl8192cu chipset shows very poor performance (~50 kb/s downlink).

The debug information attached is with the drivers mentioned above installed.

WORKAROUND: Install drivers via realtek:
http://www.realtek.com/downloads/downloadsView.aspx?Langid=2&PNid=21&PFid=48&Level=5&Conn=4&ProdID=277&DownTypeID=3&GetDown=false&Downloads=true

According to this page, this driver is merged into the main kernel since 3.0.2.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.5.0-25-generic 3.5.0-25.38~precise1
ProcVersionSignature: Ubuntu 3.5.0-25.38~precise1-generic 3.5.7.4
Uname: Linux 3.5.0-25-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: VT1828S Analog [VT1828S Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: mazzzy 1819 F.... pulseaudio
 /dev/snd/controlC0: mazzzy 1819 F.... pulseaudio
 /dev/snd/pcmC0D0p: mazzzy 1819 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf3ff8000 irq 51'
   Mixer name : 'VIA VT1828S'
   Components : 'HDA:11064441,104383d0,00100100'
   Controls : 52
   Simple ctrls : 24
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xf7afc000 irq 17'
   Mixer name : 'Nvidia GPU 12 HDMI/DP'
   Components : 'HDA:10de0012,10de0101,00100100'
   Controls : 24
   Simple ctrls : 4
Date: Sun Feb 24 10:08:06 2013
HibernationDevice: RESUME=UUID=5d3f78d2-bc2f-4c30-806b-f63d453e1000
MachineType: System manufacturer System Product Name
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-25-generic root=/dev/sdb6 ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-25-generic N/A
 linux-backports-modules-3.5.0-25-generic N/A
 linux-firmware 1.79.1
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/14/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1504
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P7P55D-E
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1504:bd12/14/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55D-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.8 kernel[0] (Not a kernel in the daily directory) and install both the linux-image and linux-image-extra .deb packages.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.8-raring/

[panmari (panmari)]

You are right, using the kernel version 3.8.0-030800-generic, I get the expected 1 mb/s downlink. Thanks for helping me out. Any chance you'd know if/when this will be merged into the 12.04 kernel?

[panmari (panmari)]

After an hour or so though, it stopped working altogether for a short period of time (about 2 minutes). No idea what that was... Found this in the sys.log:

Feb 27 18:16:59 lazy-home kernel: [ 42.367493] audit_printk_skb: 27 callbacks suppressed
Feb 27 18:16:59 lazy-home kernel: [ 42.367496] type=1400 audit(1361985419.428:24): apparmor="DENIED" operation="open" parent=1 profile="/usr/lib/telepathy/mission-control-5" name="/usr/share/gvfs/remote-volume-monitors/" pid=2327 comm="mission-control" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Feb 27 18:29:33 lazy-home kernel: [ 795.843234] type=1400 audit(1361986173.900:25): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1000 comm="cupsd" pid=1000 comm="cupsd" capability=36 capname="block_suspend"
Feb 27 18:42:34 lazy-home kernel: [ 1575.244550] type=1400 audit(1361986954.544:26): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1000 comm="cupsd" pid=1000 comm="cupsd" capability=36 capname="block_suspend"
Feb 27 18:55:35 lazy-home kernel: [ 2354.728537] type=1400 audit(1361987735.268:27): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1000 comm="cupsd" pid=1000 comm="cupsd" capability=36 capname="block_suspend"
Feb 27 19:21:36 lazy-home kernel: [ 3913.595787] type=1400 audit(1361989296.616:28): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1000 comm="cupsd" pid=1000 comm="cupsd" capability=36 capname="block_suspend

[panmari (panmari)]

I still experience slow performance with kernel 3.9.0-999 (most recent ubuntu kernel). Also the drivers provided by realtek are not compilable anymore in 13.04. Any way I can help to fix this?

[Chris (chrisjlee)]

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...

[penalvch (penalvch)]

Panmari, could you please confirm this issue exists with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.11-rc3

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

[penalvch (penalvch)]

Jeb E., please do not adjust the Status, or mark this a duplicate of another report (or vice versa).

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]