12-19-2011 06:12 PM
I have an X220 running Windows 7 Home Premium x64. I recently got a Dell U2412M external monitor, and wanted to connect via displayport since both the monitor and the X220 have displayport. I've tried two different displayport -> displayport cables but neither have worked. I troubleshooted the monitor with a couple of built-in self-tests and it seems to be fine, and I also tried changing the BIOS setting to automatically output over displayport on startup. This only worked for the initial bootup screens, and then once the Windows login screen loaded, the display switched back to the X220 LCD. So it appears that all 3 pieces of the puzzle are functional, since the display briefly works during startup. Perhaps this is a software/driver issue? A handshaking problem between the devices? I have the latest video drivers and BIOS.
12-19-2011 09:29 PM
12-19-2011 11:30 PM - edited 12-19-2011 11:32 PM
I have almost the same setup - X220 and DELL U2410. And using the displayport on the Ultrabase 3.
Does it work if you use the VGA connection?
You have ofcourse tried to change the input selection = DisplayPort on the U2410? I have both the VGA cable (from another computer) and the DisplayPort cable in the monitor, and it doesn't switch between the sources automatically.
You state that you have a Win7-64 home premium - is that installed by yourself or is it the factory installed Lenovo OS? On mine i have Win7-64 professionel. If it is your own installation, the standard OS might not find the DisplayPort if it is some kind of generic Lenovo hardware.
Can you find the DisplayPort in the device manager? If yes, is it disabled?
Have you checked if there is any BIOS setup related to the DisplayPort? (i haven't got my X220 here, so i can't check it)
I remember that when i tested the monitor in the beginning to see if VGA or DisplayPort was best, i had 3 monitors in the Intel setup program, and i had some problems finding out which of the 2 external monitors that was the DisplayPort.
When i get home i will look if i can see anything in the setup that might cause your problems - it SHOULD work.
12-20-2011 12:26 AM
It does work over VGA, and I did change the input selection on the U2412M. It detects that there is something plugged into the displayport, but the monitor goes into "power save" mode because it isn't getting a signal from the device on the other end, in this case the X220.
I did a clean install of Home Premium because I changed from a HDD to SSD, I tried looking around through Lenovo's support site to see if I missed installing an important driver but I didn't see anything. I could be wrong about that however.
Where do I find displayport in the device manager? The only BIOS-related option I found regarding displayport was a boot setting, which lets you choose the device connected via displayport as the default display when booting up.
12-21-2011 04:50 AM
Did you install the whole Intel HD3000 package? I don't know if the package from Lenovo download contain all drivers and applications, but i would try that.
12-23-2011 01:37 PM
I've tried manually switching via Fn/F7 but it says "unable to connect to projector, no projector was detected", even though both devices are on and both are connect to each other via displayport.
01-17-2012 06:24 AM