On Thu, Sep 28, 2017 at 05:03:14PM +0200, tu...@posteo.de wrote:
> I have one of these:
>
> Bus 006 Device 018: ID 16d0:0753 MCS Digistump DigiSpark
>
> ... snip ...
>
> SUBSYSTEMS=="usb", ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="0753", 
> MODE:="0666"
> KERNEL=="ttyACM*", ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="0753", 
> MODE:="0666", ENV{ID_MM_DEVICE_IGNORE}="1"

This udev rule looks fine, it tries to make the device nodes 
readable/writeable to everyone and makes modemmanager ignore it.

My guess would be that you don't have the correct serial port driver 
built or loaded, so ttyACM nodes are not created at all.

Take a look at dmesg contents when the device gets plugged in.

-- 
mlen

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