I have an Acer laptop with HD5500 connected straight via HDMI to an LG 26UM66
Bandwidth is sufficient.
I guess your system is confused by the adapter.
Did you try a miniDP-DP connector?
Otherwise try different driver versions. Generic or from manufacturer.
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Thank you for your comment.
I am, to be honest, worried that it is an adaptor issue due to the fact that the adaptor was very expensive and is non-returnable. Due to this, I do need to make sure that I examine other options before acquiring further hardware.
I have updated the driver, but was unable to use the Generic driver (which is far more recent), as the Lenovo system refused to install the Intel driver.
Windows update offers the latest build 4703 for Lenovo OEM
Install this or the generic driver build via "have disk method" as described at:
(ignore prolog about MS surface)
Treat CAB like ZIP
Thanks again for your help, and follow up. I'm away from the computer until later this week. When I return I shall try the driver update.
The adapter I bought here was the equivalent of 33 Euros!
I finally got a chance to try the driver, and followed the process as per the link(s). It ruminated on the install for a time, and eventually said there was an error with installing the driver, as it did not support the version of windows on the computer.
I am a bit mystified.
You never mentioned which one you use.