Screen rotation - 90 degrees please.

Okay, yes I’ve scoured the internet. It should be so simple but I can’t seem to rotate the screen from portrait to landscape.

The screen is a waveshare 5.5inch HDMI AMOLED, so following their instructions, I have altered the config.txt file to include -

hdmi_timings=1080 1 26 4 50 1920 1 8 2 6 0 0 0 60 0 135580000 3

This means upon boot, I have an image. Continuing with there instructions, when I add the line -
display_rotate=1 and reboot, the screen stays blank, (nothing).

Edit, just to add -
I’ve realised that the settings for the Touch display plugin can be changed. So after changing “Rotate screen content” by 90degs and enabling the GPU with 128mb memory size… Everything seems to be working.

I checked these configurations with rasbian and they work fine.

Also resorted to trying lcd_rotate=1 as well as display_hdmi_rotate=1, TNA. Please advise?