kernel-packages team mailing list archive

[Tomas Mrozek <mail@xxxxxxxxxxxx>]

Public bug reported:

I experience very slow download speed when connecting to a Cicso EPC3928
cable modem. The speedtest.net reports about 0.2Mbps download speed and
1.1Mbps upload speed (obvious discrepancy). If I connect to the modem
via network cable, the speed gets to 30Mbps/1.1Mbps (that's the expected
speed for my line). If I connect a different device over wifi I get
5Mbps/1.1Mbsp (acceptable for a wifi connection). My conclusion
therefore is that the problem lies in the wifi connection between my
computer and the cable modem and is not due to any other devices in the
network.

The wifi connection was working well in the past with other routers. As
there were no problems I never measured the speed. Currently I don't
have access to any other wifi router/modem that I could connect to and
measure the speed.

After extensive Googling, the only widely mentioned possible cause that
I found was 802.11n protocol so I tried to disable it with "options
iwlwifi 11n_disable=1". However, this had no effect whatsoever.

The cable modem has been provided by the ISP and I currently cannot
access its config to gather more info or test different settings in
order to pinpoint possible causes for this problem.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-18-generic 3.11.0-18.32
ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
Uname: Linux 3.11.0-18-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  tom        2398 F.... pulseaudio
 /dev/snd/pcmC0D0c:   tom        2398 F...m pulseaudio
Date: Sat Mar  8 15:36:21 2014
HibernationDevice: RESUME=UUID=701b120a-4cbb-47df-b530-32c017d392ee
InstallationDate: Installed on 2014-01-03 (64 days ago)
InstallationMedia: It
MachineType: LENOVO 10115
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-18-generic root=UUID=38a215c9-0e4f-4726-9b3b-3f749f762783 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-18-generic N/A
 linux-backports-modules-3.11.0-18-generic  N/A
 linux-firmware                             1.116.2
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/18/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: EZKT16AUS
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: No DPK
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnLENOVO:bvrEZKT16AUS:bd01/18/2013:svnLENOVO:pn10115:pvrIdeaCenterQ190:rvnLENOVO:rnINVALID:rvrNoDPK:cvnLENOVO:ct3:cvrChassisVersion:
dmi.product.name: 10115
dmi.product.version: IdeaCenter Q190
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug saucy

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https://bugs.launchpad.net/bugs/1289791

Title:
  Slow wifi connection with Cicso EPC3928 modem

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I experience very slow download speed when connecting to a Cicso
  EPC3928 cable modem. The speedtest.net reports about 0.2Mbps download
  speed and 1.1Mbps upload speed (obvious discrepancy). If I connect to
  the modem via network cable, the speed gets to 30Mbps/1.1Mbps (that's
  the expected speed for my line). If I connect a different device over
  wifi I get 5Mbps/1.1Mbsp (acceptable for a wifi connection). My
  conclusion therefore is that the problem lies in the wifi connection
  between my computer and the cable modem and is not due to any other
  devices in the network.

  The wifi connection was working well in the past with other routers.
  As there were no problems I never measured the speed. Currently I
  don't have access to any other wifi router/modem that I could connect
  to and measure the speed.

  After extensive Googling, the only widely mentioned possible cause
  that I found was 802.11n protocol so I tried to disable it with
  "options iwlwifi 11n_disable=1". However, this had no effect
  whatsoever.

  The cable modem has been provided by the ISP and I currently cannot
  access its config to gather more info or test different settings in
  order to pinpoint possible causes for this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-18-generic 3.11.0-18.32
  ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tom        2398 F.... pulseaudio
   /dev/snd/pcmC0D0c:   tom        2398 F...m pulseaudio
  Date: Sat Mar  8 15:36:21 2014
  HibernationDevice: RESUME=UUID=701b120a-4cbb-47df-b530-32c017d392ee
  InstallationDate: Installed on 2014-01-03 (64 days ago)
  InstallationMedia: It
  MachineType: LENOVO 10115
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-18-generic root=UUID=38a215c9-0e4f-4726-9b3b-3f749f762783 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-18-generic N/A
   linux-backports-modules-3.11.0-18-generic  N/A
   linux-firmware                             1.116.2
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: EZKT16AUS
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: No DPK
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnLENOVO:bvrEZKT16AUS:bd01/18/2013:svnLENOVO:pn10115:pvrIdeaCenterQ190:rvnLENOVO:rnINVALID:rvrNoDPK:cvnLENOVO:ct3:cvrChassisVersion:
  dmi.product.name: 10115
  dmi.product.version: IdeaCenter Q190
  dmi.sys.vendor: LENOVO

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