Ubuntu
gpsd package

PPS capable USB GPS devices do not always deliver PPS signal

Bug #1878573 reported by Christian Ehrhardt 
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Ubuntu Server Guide
Fix Released
Undecided
Unassigned
gpsd (Ubuntu)
Invalid
Undecided
Unassigned

Bug Description

It appears the same receiver sometimes can and sometimes can't provide PPS to the system with an otherwise equal setup. We might need more data on HW-combinations to make sense of it.
So far I have:

GPS Receriber GR-701W:
- works on Raspberry pi3 + Ubuntu 20.04
- works on Raspberry pi4 + Ubuntu 20.04
- fails on a NUC5i5RYH + Ubuntu 20.04

It just as gpsd isn't even trying on this device, no failing logs.
The raw GPS stream with cgps/gpsmon do not report any pps activity.

Revision history for this message
Christian Ehrhardt  (paelzer) wrote :

I disabled apparmor on this box to check if it is another aspect of bug 1872178, but it has no effect.

Changed in gpsd (Ubuntu):
status: New → Incomplete
Revision history for this message
Christian Ehrhardt  (paelzer) wrote :

Ha, I found it to be a setup detail that I used for debugging before and missed that for proper pps usage (without hacky workarounds) is required.

I added all that is needed in https://discourse.ubuntu.com/t/network-ntp/11878
which will render it there as well as on html/pdf versions of the guide.

Changed in serverguide:
status: New → Fix Released
Changed in gpsd (Ubuntu):
status: Incomplete → Invalid
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