I2C communication failure: (iokit/?) unknown subsystem error

[blindflugmoritz]

It worked perfectly until the last week.

Now when i send the command
m1ddc set input 17

I always get:
I2C communication failure: (iokit/?) unknown subsystem error

I can do other commands but i cant run the set input command somehow. :(

any idea how to debug?

thanks & best M

[duncanfinney]

Getting the same. Are you using a hub? I think it might be related to that.

[PrinceJayJiao]

Getting the same. Are you using a hub? I think it might be related to that.

I use a hub too and get the similar question. Have you find a solution? thanks
this is my err info
DDC communication failure: (iokit/?) unknown subsystem error

[PrinceJayJiao]

Getting the same. Are you using a hub? I think it might be related to that.

I use a hub too and get the similar question. Have you find a solution? thanks this is my err info DDC communication failure: (iokit/?) unknown subsystem error

I asked the hub seller. They say that the hub do not support ddc. My hub brand is ugreen. What an upset news! it really take me so long time.