[Bug 933626] Re: acpi-support should use ck-list-sessions to determine active X display and X user

[Ayan George]

Verified that this works on a Sutton machine.

This does require a change to an OEM script that locally implements the
new getXuser though.  I'll let the OEM team know.

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https://bugs.launchpad.net/bugs/933626

Title:
  acpi-support should use ck-list-sessions to determine active X display
  and X user

Status in “acpi-support” package in Ubuntu:
  Fix Released
Status in “acpi-support” source package in Oneiric:
  Fix Committed
Status in “acpi-support” source package in Precise:
  Fix Released

Bug description:
  SRU Justificaiton
  -----------------

  Impact:

  This bug impacts all Oneiric systems which use LightDM and are
  affected by lp870297 (Lightdm logins not being logged in wtmp).

  In Oneiric, acpi-support depends on wtmp entries to determine the
  active console with getXconsole and getXuser.  Since LightDM doesn't
  write to wtmp, this affects all systems that use acpi-support scripts
  to handle ACPI hotkey events -- including yet to be released hardware
  in the enablement/certification queue.

  Fix:

  The fix is to backport the changes made in Precise to Oneiric.  This
  includes implementing getXuser and getXconsole with ConsoleKit (ck-
  list-sessions).

  Patch:

  This change is already in acpi-support .139:

    http://launchpadlibrarian.net/95198647/acpi-
  support_0.138_0.139.diff.gz

  I've attached a debdiff that backports that change to acpi-support
  .139 in Oneiric.

  Regression Potential:

  There should be very little potential for regression.  In fact, this
  should fix machines affected by lp87029, including OEM systems.

  This has been tested using the following PPA:

    https://launchpad.net/~ayan/+archive/acpi-support-sru

  ------------------------

  The acpi-support scripts use 'ps' and 'who' output to determine the
  current active X display and X user (in getXconsole and getXuser).
  Currently, LightDM does not write to utmp so 'who' does not output the
  correct information breaking getXconsole and getXuser.

  ConsoleKit properly maintains the state of the console and probably
  should be used instead.

  I've attached a patch that re-implements getXconsole and getXuser by
  calling ck-list-sessions.

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