Bug#540954: video-radeon: white flashing lines when moving cursor between screens

Michal Suchanek hramrach at centrum.cz
Thu Aug 13 14:18:47 PDT 2009

2009/8/11 Alex Deucher <alexdeucher at gmail.com>:
> On Mon, Aug 10, 2009 at 6:53 PM, Michal Suchanek<hramrach at centrum.cz> wrote:
>> Package: xserver-xorg-video-radeon Version: 1:6.12.2-3 Severity: minor File: video-radeon In a two screen setup wnenever I move the mouse cursor between screens pieces of horizontal white lines appear momentarily at random on the right edge of the primary screen. The secondary screen is right of the primary and rotated. I suspect it is specific to this hardware because the lines are quite easily noticed with light web page background and dark scrollbar in Firefox - it seems the web page is bleeding into the scrollbar. I was unable to reproduce this in a terminal or on the smaller screen so it might be also specific to the way Firefox redraws its window. Yes, there is no reason to redraw but like it would stop Mozilla products from redrawing. I did not notice this issue with Radeon X550 card and slightly older X server - had to restart it when replacing the card.
> Can you try xf86-video-ati from git master?  This sounds like a
> display watermark issue.

Same results with yesterday's git master.

The flashing lines occurs on the (physical) right of both screens
while Firefox is redrawing, especially while loading a web page. On
the smaller screen the right side is the logical top which typically
contains some menus or toolbars so the effect is not so easily

It happens even when Firefox is not mapped (ie if  I restart Firefox
which causes page loading and switch to a different desktop the lines
appear on the visible desktop.



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