[ltp] Dual external monitors with X220?

Micha Feigin linux-thinkpad@linux-thinkpad.org
Sun, 13 Jan 2013 18:45:06 -0500

On 01/13/2013 04:00 PM, Rubin Abdi wrote:
> Mini Dock Series 3 plus
The internal GPU (intel gma 4000) only supports two displays I believe, 
which means either two external or one internal and one external. It 
will not drive three displays (hardware limitation).

Under windows you can use a usb displayling adapter to get up to 6 
external displays (good for text, no so much for video), but 
unfortunately, support under linux is mostly non-existant. You can run 
it as a framebuffer device if memory serves, but that does not do video 
acceleration and does not support dynamic connect/disconnect.

Optimus (nvidia + intel) laptops will support two external displays + 
internal, but again, last time I checked that was windows only. Due to 
the fight between kernel developers and NVIDIA about open sourcing their 
drivers, they will not give NVIDIA access to the symbols required to 
enable optimus on linux.