I managed to solve my issue: I found a passive DisplayPort to HDMI
adapter that works (the colors on the TV are as expected).
But I still think that there is a software issue, or an issue that ca be
solved with software, since with the exact same hardware the colors are
fine with certain software.
** Attachment added: "result of "xrandr --verbose" from the Mint live DVD,
while the screen was mirrored and with the colors looking fine"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1586787/+attachment/4672312/+files/xrandrmint.txt
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Public bug reported:
Hi,
On a Lenovo Thinkpad T420, with an Intel Core i5-2520M CPU and
integrated graphics, when using a Samsung UE40J5200AW 40in TV with a
DisplayPort to HDMI adapter and an HDMI cable, the colors are very wrong
on the TV.
This happens on a brand new Ubuntu 16.04 installation m
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