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Ubuntu Core rotate screen Raspberry Pi 3

rated 0 times [ 0] [ 0] / answers: 1 / hits: 1400 / 2 Years ago, sun, may 22, 2022, 9:03:08

The display on my Ubuntu Core, latest version (18), on a Raspberry Pi 3 is upside down. The display is connected via the ribbon cable on the Pi, not via HDMI.

I first tried via the system snap config (restarted the system each time).

snap set pi-config.display-rotate=2

snap set pi-config.lcd-rotate=2 (does not work, unsupported system option)

I tried values 1, 2, and 3. Setting pi-config.display-rotate=1 and rebooting shows a white display but the Pi doesn't boot, a power reset was needed to get it booted.

I also tried via the config.txt (writable partition: system-data/boot/config.txt). Took the SD card out, edited the file on another computer and restarted the Pi each time (tried values 0, 1, 2, and 3).

display_rotate=2

lcd_rotate=2

The screen doesn't budge. It never changes the rotation. Editing the boot.txt on Retropi (same hardware) did work correctly. Is there a special way to rotate the screen on Ubuntu Core?

Just so I understand this correctly: the "Core" logo and text (where it shows the login via SSH instructions) is upside down. I have no Wayland or X11 running. Maybe I misunderstand this and the screen is only supposed to turn in a graphical environment?

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ibuteking

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answered 2 Years ago stantildlike · Accepted Answer

I finally got it to work the correct way, not the workaround described in my other answer.

There are 2 display connectors on the Raspberry Pi board: the HDMI and display ports. The HDMI is the one with the HDMI plug (easy enough), the display one is where you connect the ribbon cable. I am using the ribbon cable. Changing the HDMI settings doesn't change a thing, I needed the lcd_rotate setting which is the one rotating the display, not the HDMI screen! :facepalm:

lcd_rotate=2 # rotates the screen connected to the display port

display_hdmi_rotate=2 # rotates the screen connected to the HDMI port

display_lcd_rotate=2 # no idea what screen this applies to

The second mistake was to edit the wrong config.txt file. I was editing a config.txt in the writable/system-data/boot or writable/system-data/boot/uboot directories but that's NOT where Ubuntu Core looks. The config.txt file is located in the other partition on the SD card, in the root of the system-boot partition!