[Bug 92419] New: radeon driver on lubuntu 14.04-15.10 displays white flickering scan lines and occasionally parts of the windows on external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92419

            Bug ID: 92419
           Summary: radeon driver on lubuntu 14.04-15.10 displays white
                    flickering scan lines and occasionally parts of the
                    windows on external monitor
           Product: xorg
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: guilherminocorreia at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 118802
  --> https://bugs.freedesktop.org/attachment.cgi?id=118802&action=edit
Small video describing the problem

This bug was reported on Ubuntu Launchpad at:
https://bugs.launchpad.net/bugs/1442378

  On a Compaq Presario 2500 laptop with an Ati IGP 345M graphics card,
  when connected to an external monitor ( SAMSUNG P2470HD - FullHD
  monitor/tv ) through a VGA analog connection, and using the latest
  open radeon driver on Lubuntu 14.04.2 with all the latest updates,
  when using the native resolution ( 1920x1080 at 60 ) of the monitor, and
  even at lower ones, except the lowest, there are small white lines
  flickering all over the display especially when there is movement in
  the windows or menus, and sometimes even small fragments of the window
  contents appear momentarily across different parts of the monitor.
  This does not happen when using a Windows XP installation on the same
  laptop with the same monitor and with the same D-Sub cable.

  I've also noticed recently that there is some banding noise only discernible
  on a solid background, as in a noisy cable transmission.

  I've tried to install the fglrx driver, but there seems to be none
  available for this card either on the AMD website nor on the
  additional drivers repository of lubuntu. Installing the fglrx driver,
  the card was never recognized. The command "sudo amdconfig --initial"
  returns the error message: "amdconfig: No supported adapters
  detected".

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