I have this firmware installed on my VIM, I just checked and xrandr(using the commands below) is not working on it. Also rotation options are greyed out in the native display manager on my installed version.
My version is different than the version shown in this thread. So my previous post may not apply. My apologies for that.
BTW each link should have gone to a different post in the same thread. First link was to my post demonstrating xrandr. The second link should have gone to a post in that thread by balbes150 where he stated rotation worked from the display manager(on his version). The display manager can be located at Preferences/Hardware/Displays. But as stated, rotation not working on the Mate version installed on my VIM now.
xrandr worked on an older version, not working now…
Open terminal and enter one of these lines…
xrandr -o left
xrandr -o right
xrandr -o normal
xrandr -o inverted