Hi,
I struggled a little bit to rotate my IR-Frame to work with my mirror in portrait mode.
So, I wrote this little guide to help you out. This is a guide from a noob to noobs ;)

first if you want to rotate your screen, follow this instruction
How to rotate your screen

then open a command prompt on your raspberry

now you must create a new folder

mkdir ~/startup_scripts

before we create a script, we need some information. Type this in your command prompt

xinput -list

it will show you something like this

this shows you the name of the IR-Frame, in my case it is IrScreen cc (yours could be different)

open a 2nd command prompt, it is time to create our script

type the following command

nano ~/startup_scripts/portrait.sh

enter this code

xinput set-prop "THE NAME OF YOUR IF_FRAME" --type=float "Coordinate Transformation Matrix" 0 1 0 -1 0 1 0 0 1

now youmust enter the exact name of your IR-Frame in the code. In my case the code would look like this

xinput set-prop “IrScreen cc” --type=float “Coordinate Transformation Matrix” 0 1 0 -1 0 1 0 0 1

save and exit with Crtl+X and Y

next step, make the script executable type

sudo chmod +x ~/startup_scripts/portrait.sh 

now we can test it type

bash ~/startup_scripts/portrait.sh

your IR-Frame should be set in the right orientation now,

in case it is inverted then your screen is in portrait mode (rotated 90 clockwise)
this will inverse the curser, open the portrait.sh file in the nano editor

nano ~/startup_scripts/portrait.sh

replace the numbers with the following
0 -1 1 1 0 0 0 0 1

and it should work for you

now we only have to add some line to this on every startup of you raspberry.

sudo nano /etc/xdg/lxsession/LXDE-pi/autostart

and add this line

@lxterminal -e /home/pi/startup_scripts/portrait.sh

close and save it with Ctrl+X and Y

all done

if you like it, feel free for a up-vote or a comment