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haimgel / display-switch

Turn a $30 USB switch into a full-featured multi-monitor KVM switch
https://haim.dev/posts/2020-07-28-dual-monitor-kvm/
MIT License
2.91k stars 112 forks source link

Daisy chaining 2 displays with only 1 that supports DDC drops the second monitor when changing #113

Closed marouamghar closed 2 years ago

marouamghar commented 2 years ago

I have 1 lenovo thinkvision P24q-10 that is DDC compatible. I am able to switch back and forth without issues. However, it is daisy-chaining to another non compatible screen. Whenever I switch, the connection is dropped, and the new computer does not recognize the second monitor, as if it was not connected at all. Switching manually the 1st monitor using its settings works correctly, both monitors connect to the computers. I am not able to figure out if the issue comes from the monitor itself or the software, but since it works using a different way, i am leaning towards the software. Thanks !

haimgel commented 2 years ago

Hard to say whether it's hardware (firmware) or software, anything that talks DDC to displays hits all kinds of corner cases and weird bugs in firmware... I suggest: try to control your screens with something other than display-switch and see what happens. There are many apps like that, ddccontrol, for example.

marouamghar commented 2 years ago

Thanks for the response. I did try another windows tool, and i am encountering the same issue. I suppose it means a deeper problem is there. I wasn't able where to report it though. Is there like a parent repo for DDC commands?

haimgel commented 2 years ago

I think the most probable source for this issue is your monitor's firmware, you could report this to the manufacturer. I don't have high hopes for them fixing the issue, though.