11-28-2011 01:47 AM
Is there anybody who succeeded in using three monitors with T420s and minidock 3 plus?
My problem is that I have to connect one monitor in analog to get all of the monitors working.
If I use three digital ports only, I can activate just two monitors at once and get an error message
like "This GPU supports up to 2 displays" in trying to activate the third one.
According to the document by Lenovo below, the only condition I have to satisfy to use three
external monitors is using DiplayPort of T420s instread of dock's for one monitor and
the D-sub connection is not required. I've updated to the latest nVidia Optimus Driver from
Lenovo and still no luck.
One strange thing is that when I use the analog port, two monitor look connected to Intel Video
and the other two look connected nVidia Video. But when I use only digital ports, nVidia has
all the three monitors and Intel has the panel of the laptop only.
Is there anybody who got the same configuration working?
11-28-2011 04:17 AM
11-28-2011 05:06 PM
11-28-2011 05:09 PM
11-28-2011 06:12 PM
Please read my first post.
I have said that I've connected one monitor to DisplayPort on my T420s and also said I've updated to the latest Optimus Driver. If I'm not using Optimus model or haven't enabled Optimus in BIOS, I cannot even install the driver.
11-28-2011 07:56 PM
I'm having the exact same problem as you and have yet to find a solution. I've called support three times and no one seems to be able to figure anything out, sad. I just bought this laptop for the sole purpose of hooking up three digital monitors and I'm about ready to send it back.
11-28-2011 09:33 PM
This is really disappointing. Lenovo is explicitly advertising that T420 is capable of quad-display setup using only digital connections. I hope it can be fixed with a driver patch but seems very unlikely.
11-29-2011 07:51 AM - edited 11-29-2011 07:53 AM
So far I've tried 3 Dell U2410's and 3 Dell G2410's in all digital combinations that are possible and haven't had any success, so I doubt it's the monitors. I rolled my BIOS back to 1.25 and nVidia drivers to 268.02, still nothing.