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[Phil Marsh <marsh.pf@xxxxxxxxx>]

I had used:
sudo iwconfig wlan0 power on
to turn on power management on my MacBook Pro Retina 13" laptop (Ubuntu 14.04) and the intermittent wifi problem appears to have gone away.
The intermittent wifi problem was especially noticable due to my connecting my machines via vnc and telnet tunneled through an  OpenVPN virtual LAN.
When the wifi was intermittent, the telnet would hang at login (even when the wifi connection seemed to be otherwise working) and also the VNC connection would eventually stop, leaving a frozen VNC window on the client connecting to the MacBook Pro. The VNC connection would not recover, even if the wifi connection recovered. Therefore, both the telnet and VNC connections appeared to be sensitive measures of wifi connectivity.
Since turning on the wifi power management, telnet and VNC appear to be stable!
I did not yet experiment further to verify that the power management setting was truelly correlated to the intermittent wifi behavior but that is something I'll likely try soon.
I will need to make the power management on permanent and I think instructions to do so are on the Web.
Thanks,
Phil

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https://bugs.launchpad.net/bugs/1312358

Title:
  14e4:4331 [MacBookPro10,2] wifi intermittent Ubuntu 14.04

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Problem: wifi is intermittent on my Macbook Pro and the logfile shows it's disconnecting
  Hardware System: Macbook Pro Retina 13" version 10,2 early 2013
  wifi firmware installed was default in Ubuntu 14.04 (mac 64bit OS) and synaptic shows the bcmwl-kernel-source to be installed. I get intermittent disconnections from the wifi which is set to g-only. Other wifi router settings have not been any better. Changing the wifi installation from the default of Ubuntu 14.04 have not improved things. I tried the firmware-b43-installer with similar results as above.

  iwconfig wlan0 | grep 'Power Management'
  Power Management:off

  ---
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  viking     2055 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=9a76124f-99fb-4ba8-8c94-f09d985809e9
  InstallationDate: Installed on 2014-04-24 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64+mac (20140417)
  MachineType: Apple Inc. MacBookPro10,2
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: \boot\vmlinuz-3.13.0-24-generic ro root=UUID=b6a171a9-799e-44f1-ab31-7d0940a39646 initrd=boot\initrd.img-3.13.0-24-generic
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/16/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP102.88Z.0106.B03.1211161133
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-AFD8A9D944EA4843
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-AFD8A9D944EA4843
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP102.88Z.0106.B03.1211161133:bd11/16/2012:svnAppleInc.:pnMacBookPro10,2:pvr1.0:rvnAppleInc.:rnMac-AFD8A9D944EA4843:rvrMacBookPro10,2:cvnAppleInc.:ct10:cvrMac-AFD8A9D944EA4843:
  dmi.product.name: MacBookPro10,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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