12-10-2013 11:24 AM - edited 12-10-2013 12:49 PM
So, I've bought one of these 27" beasts (Crossover QHD) and currently I am trying to get the monitor running with a Thinkpad x220 (i7) seated in a docking station (according to its specs, it can drive two display ports up to 2560x1600).
I connected the monitor by using a Display-Port DVI Dual cable.
I read the instructions by Linus Torvalds (yes, personally written by him!) and followed the steps below but to no avail. Here are the commands I've tried; for finding out the exact modeline:
gtf 2560 1440 60
xrandr --newmode "2560x1440_666.00" 311.83 2560 2744 3024 3488 1440 1441 1444 1490 -HSync +Vsync
xrandr --addmode HDMI1 "2560x1440_666.00"
xrandr --output HDMI1 --mode "2560x1440_666.00"
The monitor is turning on and it appears to be the right solution but the rendered image looks totally pixelated as you can see here:
What's wrong here? Do I have to tweak my Video cards driver? Seems like the refresh rate is totally out of sync?!
I tried the same machine with windows8 but to no avail, either! Thanks for any hints!
Solved! Go to Solution.
12-11-2013 04:54 AM
I think I found the root of the problem and it might be the cable. After doing some research I saw that there are active DP->HDMI cables like this one: http://www.amazon.com/Accell-UltraAV-B087B-002B-DisplayPort-Dual-Link/dp/B002ISVI3U/ref=sr_1_4?s=ele...
Does anyone has experience with these adapters?
12-12-2013 04:45 AM
Just an update on this issue: I've order a mini-display port to Dual Link DVI adapter from Kanex http://www.kanexlive.com/c30 and a Male DisplayPort to Female Mini Display Port Adapter. Will keep you posted!
12-14-2013 06:04 AM
Adapter arrived. Setup looks like this:
Displayport Male to Mini-Displayport Female attached to Dockingstation
Kanex Adapter and DVI Dual Link Cable to monitor
In Linux it works out of the box. Image perfect 2560x1440 but after a while the monitor starts to flash off and switch on again. I suspected that the USB port might cause troubles (suspend USB power due to power management), so I hooked the USB cable of the Kanex Adapter to a permanent USB power supply. I thought that solved the problem, but again after a couple of minutes the monitor started to switch off and on (at random intervals) -> very annoying.
In Windows8: basically the same behaviour, but the image has small vertical lines/glitches on top of the monitor flashing on/off thing.
I am trying to return the adapter and try another one. Or in worst case, return the monitor and get one with Dispaly Port input. If I would have known the hassle before, I would have immediately bought one with DisplayPort...
12-19-2013 06:02 AM
03-09-2014 04:28 PM
I have two monitors with this resolution (QNIX and some other cheapo Korean thing off Amazon), and both say do not run with onboard graphics or using passthrough devices like docking sta\ations. Both work with my HP 25x0 laptops with docking stations with displayport, neither work reliably with my USB 3 docking station + X1 Carbon from Lenovo with DVI-D.
The monitors have worked fine with every other GPU in a desktop system I've put them in.
04-15-2014 04:23 AM
regrettably i've also purchased one QNIX from Q0010 and cant get it work with my X230 thinkpad even with the mini DP to DVI adapter. clueless.......
04-19-2014 11:54 AM
I'm using 27" Dell u2713hm - 2560x1440 res
with X240 + ultra dock
Results: no problem (using DP - DP cable)
BUT I think in your case DVI cable could be the problem..
My Lenovo Ultra Dock (for x240) does not (afaik) support dual link dvi... so it is DP or HDMI for 2560x resolution.
You mentioned some DP -> dual link DVI converter. I'd be really carefull with this, often no-name, converters. When I looked for some cable converter (DP to HDMI or something like this) I couldn't find one that can stream resolution higher than 1080p...
So I guess that only solution with Lenovo (no dual link dvi support) is to buy monitor with DP (which is the standard for digital monitors btw)