[gpsd-users] GPSD as root cannot receive PPS

[Sara Costa Freitas]

Hello,

I am trying to configure chrony in Ubuntu 16.04 (kernel 4.15.0-52-generic), using a GPS source and a PPS pulse. I know that I have the PPS pulse, as I can see it using ppstest or ppscheck, however, if I start the gpsd as sudo, GPSD returns the error "gpsd:INFO: KPPS:/dev/ttyXR6 kernel PPS timeout unknown error", and if I try to do the ppscheck I get the following error "PPS ioctl(TIOCMIWAIT) failed: 25 Inappropriate ioctl for device". 

If I run GPSD with sudo:

• Chrony is able to sync and receive the GPS data
• GPSD is not able to collect PPS data

If I run GPSD without sudo:

• Chrony don't sync with GPS or PPS
• GPSD receives GPS and PPS information
• ntpshmmon shows info from NTP2 and NTP3
  

GPSD version: 3.19

Chrony version: 3.5 

Does anyone have this type of problem?

Best regards