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  1. Oh no. Then I updated to 21.02.03 with 5.10.21-rockchip and now the display doesn't work at all
  2. I tried with I2C connected and disconnected between screen and tinkerboard. No change. (See below, looks like i2c-3/3-0045/tinker_mcu_bl is missing ). I checked around that area and tinker_mcu_bl is missing, but folder 3-0045 exists with lots of files in there. (bottom of the post) From dmesg I also see that i2c had a failure (ret = -6). (see next paste) Looking forward I see that -6 is no device found on i2c bus (assuming that's correct?). Does anyone know if brightness control works? [ 2.446829] tinker-mcu: tinker_mcu_probe: address = 0x45 [ 2.446843] tinker-mcu: send_cmds: 80 [ 2.493126] tinker-mcu: init_cmd_check: recv_cmds: 0xC3 [ 3.161121] tinker_mcu_screen_power_up [ 3.161122] tinker-mcu: tinker_mcu_screen_power_up: [ 3.161127] tinker-mcu: send_cmds: 8500 [ 4.545081] tinker-mcu: send_cmds: 8501 [ 4.569108] tinker-mcu: send_cmds: 8104 [ 4.572138] tinker-mcu: send_cmds: send command failed, ret = -6 [ 4.574293] tinker-mcu: tinker_mcu_set_bright: bright = 0xff shadowpho@tinkerboard:~$ sudo rpi-backlight -Btinker-board -p toggle Traceback (most recent call last): File "/usr/local/bin/rpi-backlight", line 10, in <module> sys.exit(main()) File "/usr/local/lib/python3.7/dist-packages/rpi_backlight/", line 103, in main if backlight.power: File "/usr/local/lib/python3.7/dist-packages/rpi_backlight/", line 213, in power return bool(self._get_value("tinker_mcu_bl")) File "/usr/local/lib/python3.7/dist-packages/rpi_backlight/", line 85, in _get_value raise e File "/usr/local/lib/python3.7/dist-packages/rpi_backlight/", line 77, in _get_value return int((self._backlight_sysfs_path / name).read_text()) File "/usr/lib/python3.7/", line 1199, in read_text with'r', encoding=encoding, errors=errors) as f: File "/usr/lib/python3.7/", line 1186, in open opener=self._opener) File "/usr/lib/python3.7/", line 1039, in _opener return, flags, mode) FileNotFoundError: [Errno 2] No such file or directory: '/sys/devices/platform/ff150000.i2c/i2c-3/3-0045/tinker_mcu_bl'