Comment 4 for bug 46834

after some deeper investigation, I figured out, why all those problems related to kernel-2.6.15-25 came.

Running the automatic updates just updated the kernel, but did not replace the correct modules. After uninstalling all old kernels, images, headers and modules and installing all the latest stuff in synaptic, everything seems to be solved. No major problems anymore related to kernel.

Looks like, this is an issue for the guys who maintain the update dependancies :-)

For me, this issue is solved so far.