How do I make the modem never sleep?

Hardware Librem 5
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I don’t want the modem to ever sleep or disconnect. What would be a good set of udev rules for this? I want to seet high priority, and if there is a disconnection of the modem, I want the system to attempt reconnection without me having to use the kill switch.

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You can do things like this (as root)

echo 5000 > /sys/devices/platform/soc@0/38200000.usb/xhci-hcd.4.auto/usb1/1-1/1-1.2/power/autosuspend_delay_ms

or maybe

echo "on" > /sys/bus/usb/devices/1-1.2/power/control

See discussion here:

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Tie it to a chair facing bright lights and loud music?

(We have ways of making it talk.)

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Not even music, just a single monotonous tone, a flat mid-high pitch…

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5000ms is just 5 seconds… And what about the power management being on? I’ll look at it.

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Autosuspend delay of 5000 ms is good

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if you really want it to never suspend at all, then I guess you can set an even larger value.

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Set to 10,000ms, we will see how that behaves

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Update, setting it to 72-hours worked like a dream thus far.

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What, no cigarette burns?

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A few caveas, rebooting, using the kill switch, or restarting the Phosh session will reset the changes made. It is likely a good idea to script it so that upon modem disconnection (via kill switch) the command is re-ran. It could also be done during boot/login…

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