I did a new test with another laptop with Intel graphics and Ubuntu 16.04, but which has an HDMI port, connected to one of the three Samsung TVs, and the colors look fine.
Also, for what it's worth, I compared the EDID information (obtained with "get-edid | parse-edid") from this laptop with the one from the T420, and it's identical.
I did a new test with another laptop with Intel graphics and Ubuntu 16.04, but which has an HDMI port, connected to one of the three Samsung TVs, and the colors look fine.
Also, for what it's worth, I compared the EDID information (obtained with "get-edid | parse-edid") from this laptop with the one from the T420, and it's identical.