kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Tags added: bios-outdated-a34

** Tags added: regression-potential

** Tags added: maverick

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https://bugs.launchpad.net/bugs/991232

Title:
  14e4:432b Regression in wireless performance when on battery power

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  1. Steps I took that caused me to encounter the problem:
  disconnect the A/C power cable from the laptop, laptop then runs on battery power

  2. expected behavior:
  same network speed as on A/C power

  3. behavior actually encountered:
  very slow network speed

  network speed on A/C power:
  bheinsius@bheinsius-Latitude-E6400:~$ ping 192.168.0.1
  PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
  64 bytes from 192.168.0.1: icmp_req=1 ttl=64 time=1.62 ms
  64 bytes from 192.168.0.1: icmp_req=2 ttl=64 time=1.29 ms
  64 bytes from 192.168.0.1: icmp_req=3 ttl=64 time=1.29 ms
  64 bytes from 192.168.0.1: icmp_req=4 ttl=64 time=1.42 ms

  network speed on battery power:
  bheinsius@bheinsius-Latitude-E6400:~$ ping 192.168.0.1
  PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
  64 bytes from 192.168.0.1: icmp_req=1 ttl=64 time=43.4 ms
  64 bytes from 192.168.0.1: icmp_req=2 ttl=64 time=63.9 ms
  64 bytes from 192.168.0.1: icmp_req=3 ttl=64 time=85.6 ms
  64 bytes from 192.168.0.1: icmp_req=4 ttl=64 time=108 ms

  WORKAROUND: Disable the power saving measures implemented by /usr/lib/pm-utils/power.d/wireless.
  To disable them do:
  sudo touch /etc/pm/power.d/wireless

  You now should have an empty file named wireless without the executable bit set in /etc/pm/power.d.
  Check with:
  ls -lh /etc/pm/power.d/
  You should see a file like this:
  -rw-r--r-- 1 root root 0 2010-12-31 18:53 wireless

  Reference: man pm-powersave

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: bcmwl-kernel-source 5.100.82.38+bdcom-0ubuntu6.1
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
  Uname: Linux 3.2.0-24-generic-pae i686
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: i386
  Date: Sun Apr 29 18:24:00 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: bcmwl
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx 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: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bheinsius   2270 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf6fdc000 irq 46'
     Mixer name	: 'IDT 92HD71B7X'
     Components	: 'HDA:111d76b2,10280233,00100302'
     Controls      : 19
     Simple ctrls  : 10
  DistroRelease: Ubuntu 12.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=4fa3e949-ad70-4c6d-99ad-9f1db6e913cd
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MachineType: Dell Inc. Latitude E6400
  NonfreeKernelModules: nvidia wl
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic-pae root=UUID=40f929d3-6262-4978-9484-f29ad1c9be88 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
  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
  Tags:  precise precise
  Uname: Linux 3.2.0-24-generic-pae i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers
  dmi.bios.date: 12/07/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A31
  dmi.board.name: 0RX495
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA31:bd12/07/2011:svnDellInc.:pnLatitudeE6400:pvr:rvnDellInc.:rn0RX495:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6400
  dmi.sys.vendor: Dell Inc.

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