I own an older Argon One case (the one with the micro HDMI slots) that does not have any jumper head to set the mode. Now I would like to set mode 2 via i2cset but this utterly fails.
i2cdetect -l shows a bcm2835 i2c adapter, doing i2cdetect -y 1 does show 1a at 0x01a as expected, i2cset -y 1 0x01a 0xfe does not complain … alas it does not alter the power up behaviour at all.
Same on 32bit and 64bit RaspiOS and armbian.
Any suggestions ?