wrote:
I eventually did get an X270 and I am running it with three external monitors off an Ultra Dock (one VGA, one DVI, one DisplayPort) with the laptop closed.
I believe it may be partially a CPU thing - the integrated graphics in some intel CPUs may only support two display. Check the specs for your CPU. My x270 has an i5-7300U and it works fine.
Thank you for that info. Your confirmation that it will work is very helpful. I'll forge ahead.
My X270 has the following specs (see below). WIth a Core i7 CPU, I don't think that is my issue.
Could it be the wattage of the adapter connected to the dock?
● Intel Core i7-7600U Processor (4M Cache, 2.8GHz, max. 3.9GHz), vPro |
● Windows 10 Home 64 |
● Windows 10 Home 64 English |
● 12.5" FHD (1920 x 1080), IPS,Multitouch |
● 16GB DDR4-2133MHz SODIMM |
● Intel HD Graphics 620 |
● Hardware dTPM |
● Keyboard Backlit - English |
● 3+2 Button ClickPad, Fingerprint Reader |
● Hardware dTPM2.0 Enabled |
● 720p HD Camera |
● 256 GB Solid State Drive OPAL2.0 PCIe-NVMe |
● Integrated Fingerprint Reader |
● 3 Cell Li-Ion Front Battery (23.2Wh) |
● 3 Cell Li-Ion Rear Battery (23.2Wh) |
● 45W AC Adapter - US(2pin) |
● Intel Dual Band Wireless AC(2x2) 8265, Bluetooth Version 4.1, vPro |
● Qualcomm Snapdragon X7 LTE-A (Sierra Wireless EM7455) |
● 12.5" FHD IPS (1920x1080) Multi-Touch LED Backlit Display with WWAN |
Or could it be that one of the 3 external monitors must be VGA? I can't imagine that is true. VGA is the only connection I have not tried, given that it is so old. Our monitors are all HDMI or DP. To use DVI, I had to attach a DVI-to-HDMI adapter.
I tested with HDMI + DP and a mix of HDMI, DP and DVI.Changing connections did not make a difference.
I tried disabling the laptop monitor in the OS settings and I tried it with the laptop lid closed. In both cases, I end up with only two active external displays. The 3rd one never gets a signal.
Any further thoughts on this?