Hi,
1) Has this already been integrated to vdr?
A working ACPI wakeup script was written by Tobi in 2003 and has been maintained by him as a debian package since then:
http://www.e-tobi.net/vdr-experimental/pool-sid/source/addons/vdr-addon-acpiwakeup_0.0.10.tar.gz
It works nicely on my system, after turning off HPET on boot.
Regards,
Hanno