More robust input switching about display-switch HOT 2 OPEN

Yeah, your issue is not exactly the same, but related. It makes sense to do what you're proposing here (thanks for the PR!), and hopefully I'll expand on that in the future.

from display-switch.

My setup:

Macbook (closed lid) -
                       \
                         -->  KVM  -->  External display on DisplayPort1
                       /
Linux desktop --------

When switching from Linux to Mac the external display will sometimes not wake-up. I have found that display-switch can help workaround this flakiness by sending a DDC input switch command (even though only one input is connected). My display-switch.ini is as follows:

usb_device = "1532:0e03"
on_usb_connect = "DisplayPort1"

The monitor is connected to the KVM via DisplayPort1, and there are no other display cables attached to the monitor.

This workaround seems to work. (Though there are some issues WRT the timing of the DDC input-switch command, which I hope can be improved via the addition of a retry mechanic to display-switch. Please see #48). I wonder if implementing this issue as stated in the description would make this use case no longer viable?

If already on the desired input, do nothing.

Perhaps the behaviour above could be toggled by a setting, as I believe that sending a "redundant" input-switch command has the pleasant side-effect of fixing the wake-up issue with my Macbook. Incidentally, this issue seems somewhat common with Macbook + KVMs. I'm using a Level1tech's KVM and would like to suggest display-switch as a solution to others experiencing these issues.

from display-switch.