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[Launchpad Bug Tracker <351900@xxxxxxxxxxxxxxxxxx>]

[Expired for gnome-control-center (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: gnome-control-center (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/351900

Title:
  gnome-display-properties blanks X when changing multi-head layout

Status in “gnome-control-center” package in Ubuntu:
  Expired

Bug description:
  Binary package hint: gnome-control-center

  Problem:  When swapping dual monitors left to right, on apply in
  gnome-display-properties one screen (the left one) blanks out;
  repeating this swapping a couple times locks up Xorg.  Using the
  'xrandr' command line tool to do the same operation works perfectly
  with no lockup.

  Discussion:  I have a dual-monitor setup using xrandr on an ATI 5xx
  card using the -ati driver.  I tested out gnome-display-properties by
  launching it and then simply swapping my two monitors left-for-right
  (no other changes).

  The first time I hit apply, the left monitor turned blank with "No
  Signal" shown.  The right monitor displayed what was on the left
  monitor before, and did so in a manner that suggested gnome-panel was
  still assuming two monitors and not one.  The cursor also disappeared
  off the edge of the remaining screen in a manner suggesting that X
  thought there was another monitor.  In the past, vt-switching would
  sometimes bring the second screen back, but this time it didn't.  I
  let the confirmation dialog time out, and it returned the system to
  the original layout.

  Repeating this exact process a few times, both screens blank.  I can
  restore them by vt switching and/or re-running xrandr.

  I attempted to reproduce the issue using only xrandr, via the command
  `xrandr --output DVI-0 --left-of DVI-1`, alternating --left-of and
  --right-of appropriately.  I repeated this a dozen times and it always
  worked perfectly.

  (In fact, with gnome-display-properties, there is always a couple
  second delay after hitting apply, whereas with the xrandr command line
  tool, the change is instantaneous.  Maybe that's a clue.)

  Because I can reproduce this bug only when using gnome-display-
  properties, and not with 'xrandr', I am assuming this to be due to a
  bug in the gnome capplet, not a bug in Xorg.

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