[Libreboot] lcd-panel 1440x900 not working (external monitor ok)

[Marcel Maci]

Hello,
I flashed my Thinkpad T400 yesterday (with last stable release 20150518). 
Everything works (like a charm!), but not my LCD-screen: it's 1440x900 and I 
read on the compatibility list that "some" of the lcd-panels with higher 
resolution (I suppose higher than 1280x800?) can fail in Libreboot (apparently 
mine does). When I boot the Thinkpad up, I quickly get a backlight flicker 
(which turns then off permanently) and no GRUB, no GNU/Linux. But I can use an 
external monitor which works fine.
My question is: is the only way to solve this issue that I replace the 
lcd-panel (by one which has 1280x800 resolution) or can I try to flash a newer 
(experimental) version of Libreboot. Thanks for your answer - I also post the 
results of "xrandr --props" in case it helps to answer the question.
Marcel

Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 32767 x 32767
LVDS1 connected (normal left inverted right x axis y axis)
    EDID:
        00ffffffffffff0030ae364000000000
        00120103801e1378ea4b859257568a28
        20505400000001010101010101010101
        010101010101b027a08051841a303020
        360030be100000197021a09851841a30
        3020360030be100000190000000f0095
        0a32950a28191900320c3c01000000fe
        004c503134315750322d544c4231001f
    BACKLIGHT: 0
        range: (0, 15)
    Backlight: 0
        range: (0, 15)
    scaling mode: Full aspect
        supported: None, Full, Center, Full aspect
   1440x900       60.2 +   59.9     50.0 
   1360x768       59.8     60.0 
   1152x864       60.0 
   1024x768       60.0 
   800x600        60.3     56.2 
   640x480        59.9 
VGA1 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 
474mm x 296mm
    EDID:
        00ffffffffffff0004720e00eb196083
        24120103082f1e78eade95a3544c9926
        0f5054bfef90a940714f81408bc09500
        950f9040010121399030621a274068b0
        3600da2811000019000000fd00384d1f
        5411000a202020202020000000ff004c
        41573043303032383633310a000000fc
        0050323231570a202020202020200057
   1680x1050      60.0*+
   1600x1200      60.0 
   1400x1050      60.0 
   1280x1024      75.0 
   1440x900       75.0     59.9 
   1280x960       60.0 
   1360x768       59.8 
   1152x864       75.0 
   1024x768       75.1     70.1     60.0 
   832x624        74.6 
   800x600        72.2     75.0     60.3     56.2 
   640x480        75.0     72.8     66.7     60.0 
   720x400        70.1 
DP1 disconnected (normal left inverted right x axis y axis)
    Broadcast RGB: Automatic
        supported: Automatic, Full, Limited 16:235
    audio: auto
        supported: force-dvi, off, auto, on
VIRTUAL1 disconnected (normal left inverted right x axis y axis)