# Rexroth VPB 40.4 (Congatec board) I²C bus lookup on cold machine
# uname -a ; modprobe i2c-dev ; i2cdetect -l | sort
Linux Testwand-im-Technikum 4.9.303-rt192 #3 SMP PREEMPT RT Wed Apr 27 17:41:21 CEST 2022 i686 GNU/Linux
i2c-0   smbus           SMBus I801 adapter at f040              SMBus adapter
i2c-1   i2c             i915 gmbus dpc                          I2C adapter
i2c-2   i2c             i915 gmbus dpb                          I2C adapter
i2c-3   i2c             i915 gmbus dpd                          I2C adapter
i2c-4   i2c             DPDDC-B                                 I2C adapter
i2c-5   i2c             DPDDC-C                                 I2C adapter
i2c-6   i2c             DPDDC-D                                 I2C adapter