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[Anders Granskogen Bjørnstad <andersgb@xxxxxxxxx>]

I also observe the bug reported here, and I can confirm that the dmesg
errors are still present in 3.17 (tested with 3.17.0-031700rc4-generic).

Every time iwconfig is invoked, a new pair of dmesg errors like this appears:
[ 1468.755300] ERROR @wl_dev_intvar_get : error (-1)
[ 1468.755304] ERROR @wl_cfg80211_get_tx_power : error (-1)

Btw, I am using Ubuntu 14.04 on a Macbook Pro 11,1 (late 2013 retina).
Happy to help with additional info if that is of interest.

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https://bugs.launchpad.net/bugs/1360887

Title:
  ERROR @wl_cfg80211_get_tx_power : error (-1)

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Description:    Ubuntu 14.04.1 LTS
  Release:        14.04
  Ubuntu 3.13.0-34.60-generic 3.13.11.4

  
  Packages:
  linux-headers-3.13.0-34 ---- 3.13.0-34.60
  linux-headers-3.13.0-34-generic ---- 3.13.0-34.60
  linux-image-3.13.0-34-generic ---- 3.13.0-34.60
  linux-image-extra-3.13.0-34-generic ---- 3.13.0-34.60
  linux-libc-dev:amd64 ---- 3.13.0-34.60
  bcmwl-kernel-source ---- 6.30.223.141+bdcom-0ubuntu2

  Error flooding syslog and dmesg:

  [  849.335833] ERROR @wl_dev_intvar_get : error (-1)
  [  849.335837] ERROR @wl_cfg80211_get_tx_power : error (-1)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-34-generic 3.13.0-34.60
  ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
  Uname: Linux 3.13.0-34-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  waver      3036 F.... pulseaudio
   /dev/snd/controlC0:  waver      3036 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sun Aug 24 21:08:12 2014
  HibernationDevice: RESUME=UUID=8c728597-f27b-4e83-a813-c25f6b076b7d
  InstallationDate: Installed on 2012-03-01 (906 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  MachineType: Gigabyte Technology Co., Ltd. X58A-UD3R
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-34-generic root=/dev/mapper/jupiter-root ro quiet splash nomodeset ipv6.disable=1 acpi_enforce_resources=lax crashkernel=384M-:128M vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-34-generic N/A
   linux-backports-modules-3.13.0-34-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/16/2011
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F8a
  dmi.board.name: X58A-UD3R
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF8a:bd05/16/2011:svnGigabyteTechnologyCo.,Ltd.:pnX58A-UD3R:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnX58A-UD3R:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: X58A-UD3R
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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