You have been subscribed to a public bug:
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@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 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 recognised. The command "sudo amdconfig --initial" returns the
error message: "amdconfig: No supported adapters detected".
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
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latest radeon open driver on lubuntu 14.04 displays white flickering scan lines
and occasional parts of the windows on external monitor
https://bugs.launchpad.net/bugs/1442378
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