Bug#346421: Extensively tested

[Laszlo]

OK. I have tested extensively the problem.

To summarize up, my though:
The problem exist only in gtk 2.8.x, I assume that this version (2.8.x)
depend on cairo, which corresponds to accelerate rendering, and in
version 2.6.x there was no cairo. (If Im wrong correct me).

So the bug is either in gtk or in cairo or in xorg or in nvidia
propriatary driver.

I have tested this bug with "nv" driver too. The bug does not appear
with the "nv" driver (included in xorg 6.8.2). But the external vga does
not work (so I must use the propriatary driver).

With the propriatary nvidia driver (version 1.0.7474, installed from
nvidia-kernel-source) the bug appear only, when I enable the following
option:

Option  "RenderAccel"   "true"

(So I have commented out, and it works now. Just my windows are somewhat
slowish)

Due a bug in nvidia driver I must load the nvidia module with the
following option (to not have 5 centimeter black bar on my laptop
screen. My resolution is 1280x800):
NVreg_SoftEDIDs=0 NVreg_Mobile=0

I have found in the nvidia driver (version 1.0-8178) changelog the
following:
,,Fixed a corruption bug with RenderAccel and the Composite X extension
when using wide desktops.''

Maybe this bug is fixed in this version (I use RenderAccel and I have
wide screen too).

I think its time to install a new 2.6.15.1 kernel with the newest nvidia
driver.

To summarize, I dont think its a bug in the debian packaging rather in
cairo/nvidia driver. So I will install the new nvidia driver, and report
the bug either against cairo and nvidia propriatary driver
(linux-bugs at nvidia.com).

Thx for the hint Sebastian.

Best regards, 
 Khiraly