Hi Philip,
After the latest apt upgrade all the issues magically disappeared. I have no
idea what fixed it, but there have been 2 kernel updates and several packages
related to gps and ntp.
On Saturday, September 7, 2024 at 03:30:31 AM PDT, Philip Cox
<2078...@bugs.launchpad.net> wrote:
Philip,
FYI the linux-modules-extra package is already installed.
Switching kernels is a PITA as this is a headless machine and I need to
find an unused monitor and keyboard.
But I would recommend that you not do anything more at this time with
this bug as there is a possibility that the problem
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** Description changed:
I have a machine with a serial attached precision reference clock with a
pps accuracy of +/- 1 nanosecond that I have been using as a stratum 1
ntp server for years.
Upon upgrading from 22.04.4 LTS to 24.
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Public bug reported:
I have a machine with a serial attached precision reference clock with a
pps accuracy of +/- 1 nanosecond that I have been using as a stratum 1
ntp server for years.
Upon upgrading from 22.04.4 LTS to 24.04.1 LTS ntp went insane.
ntpq -p shows:
xNMEA(0) .PPS.
I have verified the kernel pps_api only looks at CD by building a patch
cable to map the PPS signal into the CD pin and now all the pps_api
calls work as expected.
It is still my position that the kernel pps_api should look at all
commonly used control lines for PPS just like the pps-tools package
According to linux/drivers/pps/clients/Kconfig
config PPS_CLIENT_LDISC
tristate "PPS line discipline"
depends on TTY
help
If you say yes here you get support for a PPS source connected
with the CD (Carrier Detect) pin of your serial port.
If this is tru
A possible cause for this bug has occurred to me, but I wouldn't know
where in the kernel code to check for this.
Note: When I talk about a control line, I am using the DTE, i.e
computer, end connector reference.
In years past there was no standardization for which line on a serial
port carried t
I have rebooted with the oldest installed kernel, 5.4.0-54, and it too
has the bug.
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Title:
PPS API broken
Status in linux package
I had been running with a USB GPS for years and recently purchased a GOOD GNSS
device, so I have not had anything on this machine that accesses the pps_api
until a few days ago.
FYI I have a Raspberry Pi with Ubuntu where the pps_api works with
raspberrypi-kernel 1:1.2010727-1 if that is of any
Public bug reported:
The kernel PPS API appears to be broken. I have a serial GPS with PPS
attached to /dev/ttyS4. If I use gpsd to create /dev/pps0, gpsd fails to
see PPS data. If I disable gpsd and create /dev/pps0 with ldattach, any
app or tool run against ttyS4 works fine and does see the CTS
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