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[Libreboot] Libreboot on 15.4" T60 - Some questions on inverters.

From: Diagon
Subject: [Libreboot] Libreboot on 15.4" T60 - Some questions on inverters.
Date: Fri, 29 Jan 2016 06:04:52 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

So I have the 15.4" version of an intel integrated graphics T60 that I'd
like to see if I can get libreboot working on.  I gather that the screen
it comes with:

Samsung LTN154X3-L0A (15.4" 1280x800)

will not work, and from the comments on the compatibility list (along
with an IRC chat with @pehjota), I gather that the problem is with the
LCD inverter.  That the machine will work with libreboot and even with
an external monitor, but that initialization of the LCD will fail due to
some problem initializing the inverter.  (Please correct me if I'm wrong

Also listed on the website are 4 screens that are "untested" and whose
status is unknown/untested:

Samsung LTN154P2-L05 (42X4641 42T0329) (15.4" 1680x1050)

LG-Philips LP154W02-TL10 (13N7020 42T0423) (15.4" 1680x1050)

LG-Philips LP154WU1-TLB1 (42T0361) (15.4" 1920x1200)
Samsung LTN154U2-L05 (42T0408 42T0574) (15.4" 1920x1200)
   (for T61p but it might work in T60. Unknown!)
   [Both of these are now known, see next...]

Since the inverter appears to be the issue, I spent some time on talking to an old timer to ask if any of the
available 15.4" screens might have different inverters, in the hope that
one might work.  The thread is here:

The upshot is that: (1) any of these screens can be used in that T60.
Indeed, screens can be freely switched between any of the T6x/p's.  (2)
All 15.4" screens use the same inverter made by Foxconn, FRU #41W1338.

So that sounds dismal, but there is one ray of hope (maybe??).  There
are three other inverters that will also work for all of these screens
(including the original Samsung LTN154X3).  These are:

13R1014/13R1015 made by Sumida.
42T0078/42T0079 made by Hitachi, also has marking INVC753.
41W1012/39T5658 made by Hitachi, also has marking INVC753.

I have found the first two of these on ebay (use the FRU to search).

So my questions:

(a) Does anyone have a clue whether any of these 3 inverters might work?

(b) What exactly is the problem the inverter introduces?  The EDID is on
the screen, as I understand, so what logic resides on the inverter?

I do have one more question.  If an alternate inverter turns out not to
be a choice, would coreboot (as opposed to libreboot) work on this
machine?  I know that it will work on a T60p, but that's with an ATI
blob, and I gather that blob initializes the LCD, including the
inverter.  With this Intel T60, there's no blob, so I'm guessing there's
no way to get coreboot to run (?)


PS. I am pretty confident of my informant at, as you may
also be if you look here:

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