[Dri-users] Resolutions higher than 1600x1200 cause screen artifacts

[Jeffrey W. B. <jw...@ac...>]

Hello fine folks,

I have built the DRI project from CVS as Friday, 27 October.  It is
working mostly fine on my G400 Max.  Unfortunately, I get peculiar screen
artifacts at very high resolutions.  First, here is my system:

AMD Athlon CPU
AMD 751/756 chipset
Matrox G400 Max, 32MB, Dual Head
256 MB main memory

I run this system at 2000x1500 pixels in X, at 16-bit color due to the DRI
not working in 32-bit.

Anyway, whenever I run any OpenGL application at the resolution 2000x1500,
the display is screwy.  For example, if I run gears -root at this
resolution, a white box, about 10-pixels tall, appears at the top of the
window, and flickers different colors.  Also, the pointer cursor becomes a
very large (about 100x100 pixels) black square.

The same is true of the OpenGL game bzflag.  At this resolution, its
display is corrupted in several ways.

Regular 2D programs are also affected.  If any window draws near the
bottom of the screen, a box-shaped artifact appears at the top of the
screen, similar to the artifact seen with gears.  You can test this just
with two xterms.  This causes problems in KDE, because it uses a
root-sized-but-not-root window for the desktop, and draws a panel at the
bottom.  This causes blacked-out areas at the top of the desktop.

None of these problems are present if I simply turn the resolution down to
1600x1200.  In fact, the problems are present at every resolution
that is higher than 1600x1200.  However, I require 3 megapixels :)

Has anyone else seen these types of problems at high resolutions?  Is
there any inherent limiting resolution in the current XFree86/DRI code, or
the G400 driver, or the G400 card itself?

I don't have any of these problems when using the XFree86 4.0.1 release.