The bug has been tracked (and solved) on the Debian list: http://lists.debian.org/debian-kernel/2004/08/msg01883.html
Apparently, it comes from a bug in the Kernel 2.6.8-1, and should be fixed with the Kernel 2.6.8-3.
Here are some more explainations:
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&c2coff=1&th=dbce4a618e91ea4&seekm=2vbef-2oe-11%40gated-at.bofh.it#link10
and:
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=130576#c9
Denis
