Black screen when running OpenGL app (non-locking)

[Ancoron Luciferis]

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Hi there,

I just have upgraded my radeon driver using the xorg-edgers PPA from git
master commit

f39cafc5c4a93a16ac93756473ebb1f33c7881db (2009/06/29)

to

43db263d301082e84e9bc304816bcbb206fe280e (2009/07/09)

on an AMD64 Kubuntu Jaunty with an X1950XTX.

After every driver update I run some manual tests. The first thing I
encountered was that using the KDE4 wobbly window effect it is really
slow in the beginning. After moving around a window for some seconds it
gets much smoother but not really smooth.

But that is not the real issue. The next thing I tested was glxgears.
But when I run it the screen (both monitors of my dual-head CRT setup)
go blank (but not off) and it stays black until I press <ESC> or
terminate the glxgears process in another way. As long as the mouse
cursor is hardware processed I can still see it (yes, on the black
screen) and when moving around it changes accordingly. When glxgears is
terminated the screen comes back within a fraction of a second and all
things behave like before.

The same issue happens with all applications that open an OpenGL
context. There is nothing about that in Xorg.0.log but the same issue
appears also in XFCE so it it not a WM problem.


What can cause that issue?

Thanx,

Ancoron

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