Hello,
Yes, bug fixed in the latest -proposed kernel.

Thank you
Emmanuel.

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https://bugs.launchpad.net/bugs/1790096

Title:
  PTP no longuer working on igb since 4.15.0-33

Status in linux package in Ubuntu:
  Fix Committed

Bug description:
  ptp4l is no longer able to sync the PHC of a i350 (igb driver) since 
4.15.0-33-generic.
  4.15.0-32-generic work.

  It no longer reach the slave state and is stuck to UNCALIBRATED:

  Aug 31 10:03:29 ptp4l[1259]: [79.208] [0:enp7s0f1] port 1: link up
  Aug 31 10:03:29 ptp4l[1259]: [79.260] [0:enp7s0f1] port 1: FAULTY to 
LISTENING on INIT_COMPLETE
  Aug 31 10:03:30 ptp4l[1259]: [80.814] [0:enp7s0f1] port 1: new foreign master 
ec4670.fffe.009fc5-1
  Aug 31 10:03:34 ptp4l[1259]: [84.815] [0:enp7s0f1] selected best master clock 
ec4670.fffe.009fc5
  Aug 31 10:03:34 ptp4l[1259]: [84.815] [0:enp7s0f1] port 1: LISTENING to 
UNCALIBRATED on RS_SLAVE
  OR
  Aug 31 10:53:44 ptp4l[1259]: [3094.219] [0:enp7s0f1] timed out while polling 
for tx timestamp
  Aug 31 10:53:44 ptp4l[1259]: [3094.219] [0:enp7s0f1] increasing 
tx_timestamp_timeout may correct this issue, but it is likely caused by a 
driver bug
  Aug 31 10:53:44 ptp4l[1259]: [3094.219] [0:enp7s0f1] port 1: send delay 
request failed
  Aug 31 10:53:44 ptp4l[1259]: [3094.219] [0:enp7s0f1] port 1: UNCALIBRATED to 
FAULTY on FAULT_DETECTED (FT_UNSPECIFIED)
  Aug 31 10:54:00 ptp4l[1259]: [3110.292] [0:enp7s0f1] port 1: FAULTY to 
LISTENING on INIT_COMPLETE
  Aug 31 10:54:02 ptp4l[1259]: [3112.052] [0:enp7s0f1] port 1: new foreign 
master ec4670.fffe.009fc5-1
  Aug 31 10:54:06 ptp4l[1259]: [3116.053] [0:enp7s0f1] selected best master 
clock ec4670.fffe.009fc5
  Aug 31 10:54:06 ptp4l[1259]: [3116.053] [0:enp7s0f1] port 1: LISTENING to 
UNCALIBRATED on RS_SLAVE

  On 4.15.0-32-generic:
  Aug 31 09:52:27 ptp4l[2392]: [654.860] [0:enp7s0f1] port 1: new foreign 
master ec4670.fffe.009fc5-1
  Aug 31 09:52:31 ptp4l[2392]: [658.861] [0:enp7s0f1] selected best master 
clock ec4670.fffe.009fc5
  Aug 31 09:52:31 ptp4l[2392]: [658.861] [0:enp7s0f1] port 1: LISTENING to 
UNCALIBRATED on RS_SLAVE
  Aug 31 09:52:33 ptp4l[2392]: [660.737] [0:enp7s0f1] port 1: minimum delay 
request interval 2^1
  Aug 31 09:52:34 ptp4l[2392]: [662.037] [0:enp7s0f1] port 1: UNCALIBRATED to 
SLAVE on MASTER_CLOCK_SELECTED

  I don't know if it is a driver change or a network/timekeeping change
  or other that is the root cause of this.

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