Strange visual artifacts in upper left corner of screen which respond to mouse activity.....

Eric Schuele e.schuele at
Tue Apr 25 13:57:44 UTC 2006

Eric Schuele wrote:
> Hello,
> I just recently began using GDM.  This problem is reproducible by
> enabling/disabling GDM on my machine.
> When GDM is enabled, I get four equally sized rectangles in the upper
> left corner of my screen.  They are not visible at first but are
> responsive to mouse activity.  Meaning, they slowly fill in as I move
> the mouse... and fill in almost completely, as soon as I click the mouse
> buttons.
> These squares draw on top of any window located there.  That window will
> carry the discoloration with it if I move the window.  The discolored
> squares continue, in the original location, after removing any window
> from the region.
> I originally had load glx, drm, and dri in my xorg.conf file... but
> since removed them just as an experiment.  It had no effect on the
> problem.  I also had DefaultFbBpp set to 32.  Removed that as well to no
> avail.  Just swinging wildly here.
> The squares are visible on GDM itself, and any window manager I've used
> (enlightenment and twm).
> I've got (from dmesg)
>     ATI Radeon LW RV200 Mobility 7500 M7
>     model Generic PS/2 mouse, device ID (a.k.a synaptics touchpad)
> I use Driver "radeon" in xorg.conf.
> Without GDM, no rectangles. No other portupgrades occurred when this
> behavior appeared.  Just the installation/configuration of GDM.
> Any ideas what is going on and how to remedy it?

OK... I can tell be the number of replies, everyone just rolled their 
eyes at me and figured I'm crazy.  But it really does occur.  :)

I have found that if I use the GDM provided XDMCP Chooser... that the 
problem immediately dissapears.

Anyone have any thoughts on this?


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