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[Colin Williams <lackita+ubuntuone@xxxxxxxxx>]

FWIW, my problem was just that one of my wires was loose.

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https://bugs.launchpad.net/bugs/349943

Title:
  Screen blinks randomly on external monitor

Status in xorg package in Ubuntu:
  Won't Fix

Bug description:
  Hardware: Asus F8Va laptop (Core 2 Duo P8600, ATI HD3650, 1440x900)
  OS: Ubuntu 9.04 beta x64 (Wubi installation inside Windows Vista Home Premium x64 SP1)

  External monitor (Samsung SyncMaster 2493HM, 1920x1200), connected via HDMI, blinks several times a minute, randomly. When there is no user activity, it doesn't seem to blink however.
  By "blinking" I mean, the monitor goes off and then on, like it usually does when it changes resolution, only resolution doesn't change. Also, when I move windows around, thin horizontal stripes flash in fraction of second from time to time (only on external monitor).

  Screen configuration:

  Samsung 24": On
  Resolution: 1920x1200
  Refresh rate: 60 Hz
  Rotation: Normal

  Laptop 14": On
  Resolution: 1440x900
  Refresh rate: 67 Hz
  Rotation: Normal

  Mirror screens: unchecked

  Relative position of screens (physical and in Display Preferences)
  laptop screen below the external screen, centred.

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