Apply to vanilla sources 2.6.22 ( http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.22.tar.bz2 ).
(ps : helium sources upto 2.6.22-helium2 apply to vanilla 2.6.21.)

(Description : See broken-out/ folder for individual patches.)

Short HOWTO (can `bash' it ;-) :
  $ cd /usr/src/
  $ wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.22.tar.bz2
  $ wget http://hirakendu.mooo.com/helium-sources/2.6.22-helium9/2.6.22-helium9.patch.bz2
  $ rm -rf linux-2.6.22 linux-2.6.22-helium9 linux
  $ tar -xjf linux-2.6.22.tar.bz2
  $ mv linux-2.6.22 linux-2.6.22-helium9
  $ ln -s linux-2.6.22-helium9 linux
  $ bunzip2 2.6.22-helium9.patch.bz2
  $ cd /usr/src/linux
  $ patch -p1 < ../2.6.22-helium9.patch
  $ make menuconfig      # (review only if necessary)
  $ make
  $ make
  $ rm -rf /lib/modules/2.6.22-helium9
  $ make modules_install
  $ cp arch/i396/boot/bzImage /boot/vmlinuz-2.6.22-helium9
  $ cp .config /boot/config-2.6.22-helium9
  $ cp System.map /boot/System.map-2.6.22-helium9
  $ emerge nvidia-drivers ati-drivers sys-fs/fuse svgalib \
        madwifi-ng ndiswrapper pcmcia-cs wpa_supplicant  \
        virtualbox-modules vmware-modules
        (gspcav1, ipw3945, alsa-driver, only if removed manually)
        (compile only necessary 3rd party drivers among above.)
And finally, bootloader - add lines to /boot/grub/menu.lst
(assuming root=/dev/sda5, swap = /dev/sda6) :
 -------------------
  title Helium Sources
  root (hd0,4)
  kernel (hd0,4)/boot/vmlinuz-2.6.22-helium9 root=/dev/sda5 vga=791 splash=verbose,theme:livecd-2007.0 CONSOLE=/dev/tty1 resume=swap:/dev/sda6 libata.atapi_enabled=1 noirqbalance quiet
  initrd (hd0,11)/boot/initrd.splash
(---- OR ----)
  title Helium Sources
  root (hd0,4)
  kernel (hd0,4)/boot/vmlinuz-2.6.22-helium9 root=/dev/sda5 vga=791 resume=swap:/dev/sda6 libata.atapi_enabled=1 noirqbalance quiet
 -------------------
Other options in boot loader kernel command line which may be required as workarounds for troubleshooting :-:   nolapic_timer ; nolapic ; noapic ; acpi_sleep=s3_bios,s3_mode ; nohz=off ; highres=off ; clocksource=acpi_pm ; irqpoll ; idle=poll (may burn your cpu ;-)...

Hirakendu.
(20070827)