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Tested in current libreboot. should work in coreboot (using changeset 5320 or a rebase).
<fchmmr> hey you! <fchmmr> I just got backlight controls working PERFECTLY <fchmmr> on an X60, running libreboot with native graphics init instead of vga oprom <fchmmr> Fn keys, that is. <fchmmr> it'll also work in coreboot (using change set 5320) <fchmmr> how i did it: <fchmmr> run coreboot on X60 with vgarom <fchmmr> do that to read from that address at each brightness level: <fchmmr> sudo devmem2 0xe4361254 w <fchmmr> it came back with 0x879F879E every time <fchmmr> so then I tried: <fchmmr> sudo devmem2 0xe4361254 w 0x879F879E <fchmmr> writing 0x879F879E to address 0xe4361254 <fchmmr> and then I try the Fn keys for brightness controls on the X60 <fchmmr> now it works. <fchmmr> brightenss controlls work <fchmmr> this is amazing.
Yay!
So: that address should be written with that value, by coreboot, at boot time.