xserver 1.6.3.901: lost mouse scroll wheel

[Frederik Himpe]

On one of my machines where I upgraded to Mandriva's new xserver 1.6.3.901 
I lost the mouse scroll wheel. The mouse is a Logitech MX510 USB mouse. 
Clicking the scroll wheel to paste stuff, still works, but scrolling does 
not work at all. The little "up" and "down" buttons above and under the  
wheel still scroll fine though.

xorg.conf: https://bzattachment.mandriva.com/attachment.cgi?id=14834
Xorg.0.log: https://bzattachment.mandriva.com/attachment.cgi?id=14835

x11-data-bitmaps-1.0.1-8mdv2009.1
x11-data-cursor-themes-1.0.1-8mdv2009.1
x11-data-xkbdata-1.6-5mdv2010.0
x11-driver-input-evdev-2.2.5-1mdv2010.0
x11-driver-input-keyboard-1.3.2-1mdv2010.0
x11-driver-input-mouse-1.4.0-1mdv2010.0
x11-driver-video-1.0.0-29mdv2010.0
x11-driver-video-apm-1.2.2-1mdv2010.0
x11-driver-video-ark-0.7.1-2mdv2010.0
x11-driver-video-ati-6.12.2-4mdv2010.0
x11-driver-video-avivo-0.0.1-0.20070919.1mdv2008.1
x11-driver-video-chips-1.2.2-1mdv2010.0
x11-driver-video-cirrus-1.3.2-1mdv2010.0
x11-driver-video-cyrix-1.1.0-7mdv2008.1
x11-driver-video-dummy-0.3.2-1mdv2010.0
x11-driver-video-fbdev-0.4.1-1mdv2010.0
x11-driver-video-glint-1.2.4-1mdv2010.0
x11-driver-video-i128-1.3.3-1mdv2010.0
x11-driver-video-i740-1.3.2-1mdv2010.0
x11-driver-video-i810-1.7.4-31mdv2009.1
x11-driver-video-imstt-1.1.0-8mdv2009.0
x11-driver-video-intel-2.8.1-1mdv2010.0
x11-driver-video-mach64-6.8.2-1mdv2010.0
x11-driver-video-mga-1.4.11-1mdv2010.0
x11-driver-video-neomagic-1.2.4-1mdv2010.0
x11-driver-video-newport-0.2.2-1mdv2010.0
x11-driver-video-nsc-2.8.3-5mdv2009.0
x11-driver-video-nv-2.1.14-1mdv2010.0
x11-driver-video-nvidia-current-185.18.36-1mdv2010.0
x11-driver-video-openchrome-0.2.903-6mdv2010.0
x11-driver-video-r128-6.8.1-1mdv2010.0
x11-driver-video-radeonhd-1.2.5-1mdv2010.0
x11-driver-video-rendition-4.2.2-1mdv2010.0
x11-driver-video-s3-0.6.3-1mdv2010.0
x11-driver-video-s3virge-1.10.4-1mdv2010.0
x11-driver-video-savage-2.3.1-1mdv2010.0
x11-driver-video-siliconmotion-1.7.3-1mdv2010.0
x11-driver-video-sis-0.10.2-1mdv2010.0
x11-driver-video-sisimedia-0.9.1-1.20090622.2mdv2010.0
x11-driver-video-sisusb-0.9.3-1mdv2010.0
x11-driver-video-sunbw2-1.1.0-3mdv2008.1
x11-driver-video-suncg14-1.1.0-3mdv2008.1
x11-driver-video-suncg3-1.1.0-3mdv2008.1
x11-driver-video-suncg6-1.1.0-5mdv2009.0
x11-driver-video-sunffb-1.1.0-3mdv2008.1
x11-driver-video-sunleo-1.1.0-3mdv2008.1
x11-driver-video-suntcx-1.1.0-3mdv2008.1
x11-driver-video-tdfx-1.4.3-1mdv2010.0
x11-driver-video-tga-1.2.0-3mdv2010.0
x11-driver-video-trident-1.3.3-1mdv2010.0
x11-driver-video-tseng-1.2.2-1mdv2010.0
x11-driver-video-v4l-0.2.0-4mdv2010.0
x11-driver-video-vesa-2.2.1-1mdv2010.0
x11-driver-video-vga-4.1.0-8mdv2009.1
x11-driver-video-via-0.2.2-7mdv2008.1
x11-driver-video-viaarena-20070611-8mdv2008.1
x11-driver-video-vmware-10.16.7-1mdv2010.0
x11-driver-video-voodoo-1.2.3-1mdv2010.0
x11-font-adobe-100dpi-1.0.0-7mdv2010.0
x11-font-adobe-75dpi-1.0.0-7mdv2010.0
x11-font-adobe-utopia-75dpi-1.0.1-7mdv2010.0
x11-font-alias-1.0.1-14mdv2010.0
x11-font-bitstream-75dpi-1.0.0-7mdv2010.0
x11-font-cursor-misc-1.0.0-7mdv2010.0
x11-font-encodings-1.0.2-4mdv2010.0
x11-font-misc-misc-1.0.0-9mdv2010.0
x11-proto-devel-7.4-24mdv2010.0
x11-server-1.6.3.901-1mdv2010.0
x11-server-common-1.6.3.901-1mdv2010.0
x11-server-devel-1.6.3.901-1mdv2010.0
x11-server-xephyr-1.6.3.901-1mdv2010.0
x11-server-xnest-1.6.3.901-1mdv2010.0
x11-server-xorg-1.6.3.901-1mdv2010.0
x11-server-xvfb-1.6.3.901-1mdv2010.0
x11-util-macros-1.2.2-1mdv2010.0
x11-xtrans-devel-1.2.4-1mdv2010.0


What could be wrong?
-- 
Frederik Himpe