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Re: [Bug 1349572] Re: Wireless network disconnections on Dell XPS 13

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>
Date: Mon, 04 Aug 2014 21:22:27 -0000
Reply-to: Bug 1349572 <1349572@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
On Mon, Aug 04, 2014 at 08:59:52PM -0000, Marcel Miguel wrote:
> Hi Seth,
> I had no disconnections, now for a 3h period (a fabolous improvement!)

Good!

> Speed seems to decrease, at least with a speedtest:
>   http://www.speedtest.net/my-result/3668258447
> 
> I know, it is not  a valid test, but maybe is a reference. I tested it
> with various servers and seems a limit at about 5Mbps.

I don't really think this change should affect your speed at all. A more
reliable test of performance would be to use iperf against a machine
with a wired connection to the same network, if possible, and make sure
that you're using the same network with all kernels. If it's a network
with multiple access points then you could get different results though
depending on the AP you happen to be connected to, channel, etc.

> Firmware  is 22.24.8.0.
> 
> With this versions I don't get an strange phenomenon where "System Load
> Indicator" showed equally separated peaks of infinity connection
> download speed.
> 
> Is there a method to know if there was a disconnection? I mean some kind
> of "dmesg | grep xxxx"

You could check /var/log/syslog for the string "disconnect", e.g. 'grep
-i disconnect /var/log/syslog', but that could contain logs from prior
boots so you could get false positivies. The particular problem I was
seeing (disconnection due to beacon loss) result in messages like this:

wlan0: CTRL-EVENT-DISCONNECTED bssid=xx:xx:xx:xx:xx:xx reason=4

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https://bugs.launchpad.net/bugs/1349572

Title:
  Wireless network disconnections on Dell XPS 13

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  With kernel 3.13.0.30 and 22.1.7.0, there are lots of wireless disconnections.
  Tested also with kernel 3.13.0.32 and 22.24.8.0 , also lots of wireles disconnections. 

  The AP is an ASL-26555 from Movistar(Spain). Firmware version:
  v2.0.0.51B_ESv6

  Seems that when the computer is working for some time it is more easy
  to reproduce this beahviour.

  Added this bug as sugested in #1293569, comment #91.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  marcel     2611 F.... pulseaudio
   /dev/snd/controlC0:  marcel     2611 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jul 28 22:20:19 2014
  HibernationDevice: RESUME=UUID=01981495-0235-4fdf-b7c6-c6191e986cec
  InstallationDate: Installed on 2014-01-23 (186 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. XPS13 9333
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=UUID=9d324637-b4a0-4800-a447-d17e20b708f3 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-17 (101 days ago)
  dmi.bios.date: 12/11/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A02
  dmi.board.name: 0GFTRT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA02:bd12/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  marcel     2644 F.... pulseaudio
   /dev/snd/controlC0:  marcel     2644 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=01981495-0235-4fdf-b7c6-c6191e986cec
  InstallationDate: Installed on 2014-01-23 (187 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. XPS13 9333
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=9d324637-b4a0-4800-a447-d17e20b708f3 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  Tags:  trusty
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-04-17 (103 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 12/11/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A02
  dmi.board.name: 0GFTRT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA02:bd12/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  marcel     2644 F.... pulseaudio
   /dev/snd/controlC0:  marcel     2644 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=01981495-0235-4fdf-b7c6-c6191e986cec
  InstallationDate: Installed on 2014-01-23 (187 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. XPS13 9333
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=9d324637-b4a0-4800-a447-d17e20b708f3 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  Tags:  trusty
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-04-17 (103 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 12/11/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A02
  dmi.board.name: 0GFTRT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA02:bd12/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.

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References

[Bug 1349572] [NEW] Wireless network disconnections on Dell XPS 13
From: Marcel Miguel, 2014-07-28
[Bug 1349572] Re: Wireless network disconnections on Dell XPS 13
From: Marcel Miguel, 2014-08-04