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[Jean-Baptiste Lièvremont <45018@xxxxxxxxxxxxxxxxxx>]

Similar issue on my desktop (dual DVI on nVidia GeForce GTX 560). I
often have to kill gnome-screensaver from a virtual console since the
password box does not appear.

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https://bugs.launchpad.net/bugs/45018

Title:
  Unlock screen is invisible with Nvidia twinview

Status in GNOME Screensaver:
  Fix Released
Status in “gnome-screensaver” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: gnome-screensaver

  This bug may equally be an issue with the Nvidia GLX drivers or Xorg.

  When my laptop is configured with the following excerpt from
  xorg.conf, the gnome-screensaver unlock dialog does not appear. I
  haven't tested if the dialog box appears if a second monitor/projector
  is connected.

  Further symptoms include two screensavers seeming to run at the same
  time, sometimes one screensaver briefly appears over the top of the
  other.

  # Begin xorg.conf

  Section "Device"
  	Identifier	"NVIDIA Corporation NVIDIA Default Card"
  	Driver		"nvidia"
  	BusID		"PCI:1:0:0"
  	Option		"RenderAccel"	"true"
  	Option		"Coolbits"	"1"
  	Option		"ConnectedMonitor"	"DFP,CRT"
  	Option		"TwinView"	"1"
  	Option		"Metamodes" "1280x800,1280x800; 800x600,800x600; 1280x800,NULL"
  	Option		"UseEdidFreqs" "true"
  	Option		"SecondMonitorHorizSync"       "30-96"
  	Option		"SecondMonitorVertRefresh"     "50-160"
  	Option		"TwinViewOrientation"	"Clone"
  EndSection

  # End xorg.conf

  I have disabled the ConnectedMonitor Option and all below it as a
  workaround while I do not have a second monitor connected.

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