strange mouse behavior

[bbkr]

after launching the game on default settings mouse cursor is located in the upper-left corner. and after making any mouse move it jumps into lower-right corner and stays there. if i move the mouse it works for a fraction of second and then jumps back into lower-right corner.

game was launched in 800x600 fullscreen, 800x600 windowed and 1280x1024 windowed on 1680x1050 desktop (KDE running, but i also tried separate X screen).

and once i got similar effect to this: http://frictionalgames.com/forum/showthr...p?tid=1092

my xorg.conf

-------- 8< --------
Section "InputDevice"

# Option "Protocol" "auto"
Identifier "Mouse0"
Driver "evdev"
Option "Device" "/dev/input/event2"
# Option "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Maxdata (RogenTech) B102035W"
HorizSync 31.0 - 83.0
VertRefresh 56.0 - 75.0
EndSection

Section "Device"
Identifier "Card0"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "GeForce 7900 GS"
Option "NoLogo" "true"
Option "Coolbits" "1"
BusID "PCI:5:0:0"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 6600 GT"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "0"
Option "metamodes" "1680x1050 +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
-------- 8< --------

i tried to disable multiple X screens in kdmrc (i'm not the only person using computer, 7-9 screens are permanently open), but it didn't help.

any ideas?