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[Bug 1299975] Re: wireless script checks wrong sys file


See regression bug 1544612.

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  wireless script checks wrong sys file

Status in pm-utils package in Ubuntu:
  Fix Released
Status in pm-utils source package in Trusty:
  Fix Released

Bug description:
  - on a machine with a wireless interface, run:  
    PM_FUNCTIONS=/usr/lib/pm-utils/functions sh -ex  /usr/lib/pm-utils/power.d/wireless true
    and verify that it fails with /sys/class/net/wlan0/device/enable: No such file or directory
  - install the update and run the command again and verify that the script continue beyond the point it stopped earlier, i.e. that it stops at a later point when running e.g. iwconfig 
  - now powersaving for wireless via pm-utils should work as intended from the script

  - the functionality in the script was completely broken before, by fixing this bug any bug in the power management that were previously hidden may now be uncovered. 

  On Trusty (beta), while trying to diagnose an issue with the wireless
  not connecting upon resume from standby, I discovered an invalid check
  in '/usr/lib/pm-utils/power.d/wireless'.  The script checks
  '/sys/class/net/$1/device/enable' to see if the wireless device is
  enabled, failing to perform any configuration if this sys file does
  not exist.  That happens to be the case for me (intel wireless), which
  the actual location is '/sys/class/net/$1/device/enabled' (enable ->

  Changing the script to use the correct location has not fixed my
  wireless resume issue, but perhaps it is contributing to wireless
  issues for others.  My wireless power-saving is correctly turned off
  upon resume now, though (it would get stuck in power-saving mode

  $> lsb_release -rd
  Description:	Ubuntu Trusty Tahr (development branch)
  Release:	14.04

  $> apt-cache policy pm-utils
    Installed: 1.4.1-13
    Candidate: 1.4.1-13
    Version table:
   *** 1.4.1-13 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

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