[coreboot] backlight controls working on X60 without vga option ROM (using native graphics instead)

The Gluglug info at gluglug.org.uk
Thu May 15 23:09:50 CEST 2014


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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.
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