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Posts: 48
Registered: ‎09-08-2009
Location: Vancouver, BC, Canada
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Accepted Solution

IBM T221 3840x2400 Intel graphics with a Dock 3+ WORKS

[ Edited ]

The monitor came with an LFS60-two DVI+USB cable. I need to plug the primary DVI into what Linux calls "HDMI3" and the secondary DVI into "HDMI2" and then I can see the available modes with xrandr -q (not if i plug 'em the other way around!). I can switch HDMI3 into either 3840x2400 or 1920x2400 but the moment I switch HDMI2 as well the monitor shuts down. I know the HDMI2 output works because my L220x works with it. Modelines from Xorg.0.log:


[ 14035.319] (II) intel(0): Modeline "3840x2400"x0.0  116.75  3840 3888 3920 4000  2400 2402 2408 2414 +hsync -vsync (29.2 kHz)
[ 14035.319] (II) intel(0): Modeline "1920x1200"x0.0  122.50  1920 1968 2000 2080  1200 1202 1208 1228 +hsync -vsync (58.9 kHz)
[ 14035.319] (II) intel(0): Modeline "1920x2400"x0.0  126.25  1920 1968 2000 2080  2400 2402 2412 2428 +hsync -vsync (60.7 kHz)
xrandr --output HDMI3 --mode 1920x2400 ; xrandr --output LVDS1 --off; xrandr --output HDMI2 --mode 1920x2400 --left-of HDMI3

If I stop after the first xrandr I see the monitor working (and I can do 3840x2400 as well). Also tried right-of and nothing. I am a bit stuck here.


I have active DP to dual link DVI converters in the mail and DL-DVI to LFH-60 adapters from Japan, I will try with those next. 


X.Org X Server 1.10.2, Intel driver 2.15.0, Chipset: "Sandybridge Mobile (GT2+)" (it's an i2520M CPU).


Punch Card
Posts: 48
Registered: ‎09-08-2009
Location: Vancouver, BC, Canada

Re: IBM T221 with a Dock 3+ WORKS has everything I did to get it working.