Screen rendering issue.

Hi,

such problems are usually due to graphics drivers... which are not always on par with the hardware quality, especially for "professionnal" 3D OpenGL applications running in windowed modes.

For example, I have observed systematic screen refresh and rendering issues when running Salome on a PC with Intel graphic cards (all models including i945 and X4500)... and never found a way to circumvent that! So if you have an Intel graphic card, you will have display problems in SALOME and some other 3D applications.

I have also seen some issues with ATI cards too, these are relatively minor issues compared to Intel. But I tested this a couple of years ago and I have not tested more recent ATI/AMD cards... so any feedback on which recent 3D graphic card is working well for CAE applications is welcome.

From my experience, all NVidia cards (when recognised properly by the Linux or proprietary Nvidia driver) work flawlessly for Salome / Paraview / GMSH and so on.

It would really help if you could post which hardware / driver you are using !

Intel GFX drivers are notoriously bad at the moment. Either go bug hunting on google or just accept it for now and hope they update the driver soon. (It's something to do with switching from one X.org accelerated driver to another - my laptop isn't feeling well, or have for the last year.)

Hi,

I have tried recently to solve rendering issues on an Aspire One netbook (intel 945GM graphic chip) running Ubuntu 9.04 32bits; and the only solution I have found was to disable direct rendering. Unfortunatelly, this gives me poor 3D performance, but at least a useable & clean display!

To do so, I have added the option "DRI" "off" in the Device section of my xorg.conf (/etc/X11/xorg.conf).

[code:1]
Section "Device"
Identifier "Intel GPU"
Driver "intel"
Option "DRI" "off"
EndSection
[/code:1]

...

If you have any better solution, don't forget to post it here!

PS: I have already tried the offical intel drivers from Ubuntu Jaunty (I think v2.6) as well as the previous driver version (v2.4 used in Intrepid). For each driver I have tested all options/values for AccelMethod XAA, EXA or UXA, MigrationHeuristic, Tiling, FrameBufferCompression, DDC and so on... but I always have screen refresh problems in Salome: in GEOM module, all buttons / menus are "cleared" when resizing the window or swithing from another module. This make SALOME nearly unuseable as long as DRI is not disabled.