cd /usr/src
wget http://www.kernel.org/pub/linux/kernel/v2.4/testing/patch-2.4.21-pre7.bz2
wget http://switch.dl.sourceforge.net/sourceforge/acpi/acpi-20030328-2.4.21-pre6.diff.gz
wget http://www.maol.ch/hardware/files/osl.c-patch
cp -a linux-2.4.20 linux-2.4.21-pre7
cd linux-2.4.21-pre7
make mrproper
bzcat ../patch-2.4.21-pre7.bz2 | patch -p1
zcat ../acpi-20030328-2.4.21-pre6.diff.gz | patch -p1
(cd drivers/acpi && cat ../../../osl.c-patch | patch)
# copy your dsdt.hex into drivers/acpi
# maybe use http://www.maol.ch/hardware/files/config-2.4.21-pre7 as .config
make oldconfig
make menuconfig
make dep clean bzImage modules modules_install
cp arch/i386/boot/bzImage /boot/vmlinuz-2.4.21-pre7
cp System.map /boot/System.map-2.4.21-pre7
vi /etc/lilo.conf
lilo
reboot