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

[The Gluglug]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

phcoder and moosbart, could you also try this on your macbook21's ?

On 16/05/14 00:02, The Gluglug wrote:
> For T60 (Intel GPU. Mine is 15" version): sudo  devmem2 0xe4361254
> w 0x58BF58BE
> 
> <fchmmr> I read from that address using this command: sudo
> devmem2 0xe4361254 w <fchmmr> I did that on my T60 running Lenovo
> BIOS and get this: 0xFFFFFFFF <fchmmr> I did that on my T60 (same
> one) running coreboot with vgarom and get this: 0x58BF58BE <fchmmr>
> With libreboot on a T60 (when native graphics is made to work,
> which at the moment it doesn't) you will instead do this: <fchmmr>
> sudo  devmem2 0xe4361254 w 0x58BF58BE <fchmmr> Same address,
> different value (for making backlight controls work on the
> T60/intelGPU)
> 
> On 15/05/14 22:09, The Gluglug wrote:
>> 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.
> 
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBAgAGBQJTdUlYAAoJEP9Ft0z50c+UPsoH/jPo4MRBOCJhFWpn/VhFIYq4
ZCpAZA2mkOiDzmtMww+dH2Er2+Oe1sua90dTFVHOAc9V/2n8m7MKJCufXzcAl26j
l0Kmr47vTJm0N5WA0SAIw8J7UJDgJOz68Qy441hDIJrpK5YnNoBHcvmUf92jRphC
XZbx9/8gaaVdx016s/WnvjLuSfTYx8RhiWuNo5JQnJJzy+4ebxsS8+EChcrjDWqM
zZt9IfP4+Lj7m9/jhQ8xvB+tT0YmrI6hmvJPBf7MMpjZ91vMfVPjbYr3b+idw6C4
vPiynI3zfwD4Ij/iMgC5uJDYWcOT8Ph49lPEkHFK4pNUidd+a61ELSgJXOK3X1Q=
=A9tA
-----END PGP SIGNATURE-----