How to check Raspberry Pi 4B reversion 1.2

When the first time Raspberry Pi 4B released, it is a bug in USB-C power supply circuitry. If you use the official USB-C power supply, it should be no problem. If you use other cables (marked with an "e"), it may be have compatibility problem.

It's fixed in Raspberry Pi 4B rev 1.2. So, how can you identify the reversion of your board? Use any of the commands:

$ pinout

It is shown V1.2 in the output. And also shown c03112 in Revision column, you can check Raspberry Pi revision codes here.

or use the command:

$ cat /proc/device-tree/model

or:

$ cat /proc/cpuinfo

Revision is listed c03112.

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You can also check it visually, refer to cnx-software post, Raspberry Pi 4 Rev 1.2 Fixes USB-C Power Issues, Improves SD Card Resilience.