ubuntu-x-swat team mailing list archive

[Dragomir Minkovski <dragomir.minkovski@xxxxxxxxxxxxx>]

Public bug reported:

We are having a problem on ubuntu systems with nvidia graphics cards. We
have seen this now on our development system with Dapper Drake with an
nvidia quadro fx 560, and on Hardy Heron with nvidia quadro fx 570 and
nvidia quadro fx 3700. The application was developed a decade ago on SGI
IRIX and from 2004 to 2006 on redhat linux. The problem we see is a
sudden loss of graphics performance, such as the displaying of an image
after some exercise of the program displaying images. Existing windows
continue to display as they had before. But in a new window the graphics
is real slow. You can watch the system draw the image from the bottom up
(using an Open GL call). If we restart the application all new windows
continue to draw slowly. We have to reboot the computer to restore the
prior graphics performance but once again after a short time the problem
reoccurs. It is as if hardware acceleration is turned off or something.
I don’t know where to begin to figure out what is happening. The program
displays medical CT scans.

We don't see the problem with redhat. It was the same computer. nvidia
driver was 180.44 in both cases. Which makes me think it is a bug with
ubuntu. But that is all the evidence I have to go on. I continue to see
the problem with ubuntu 9.04 and the nvidia driver 180.44 on a nvidia
quadro fx 3700. If I do all two dimensional drawing with only X calls
instead of OpenGL calls, the problem goes away. Switching to X calls at
least solves my immediate problem. I am only submitting this if there is
any interest on determining if this is in fact a ubuntu bug. I would not
know how to go about proving it.

** Affects: nvidia-graphics-drivers-180 (Ubuntu)
     Importance: Undecided
         Status: New

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graphics performance suddenly drops for new windows
https://bugs.launchpad.net/bugs/389641
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