Not sure about Carbons, but for T-series there are aftermarket IPS displays that you could swap for the original TN ones. Could be done in 30 min, with no previous experience, just with the service manuals from Lenovo and enough dexterity to handle a screwdriver.
Linux works perfectly on mine as well, but I use Fedora.
The trackpad is bearable, and I have a 3rd generation so my 1080p screen isn't IPS, but it works well enough for $200.
Not sure about Carbons, but for T-series there are aftermarket IPS displays that you could swap for the original TN ones. Could be done in 30 min, with no previous experience, just with the service manuals from Lenovo and enough dexterity to handle a screwdriver.