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
transitions every second, i.e. gpsmon and ppscheck. Anything run against
pps0 fails, i.e. ppstest, ppswatch. ntpd gets data from ttyS4 but not
pps0.
There are some issues with stock apparmor with gpsd and ntpd, but I have
solved those.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-80-generic 5.4.0-80.90
ProcVersionSignature: Ubuntu 5.4.0-80.90-generic 5.4.124
Uname: Linux 5.4.0-80-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: jimp 6811 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: GNOME-Flashback:GNOME
Date: Sat Jul 31 16:41:32 2021
HibernationDevice: RESUME=UUID=90289c8f-5a00-46c4-8f1f-79dd26128f39
InstallationDate: Installed on 2016-08-05 (1820 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-80-generic
root=UUID=389dcb0d-84f2-4340-ad6c-e4f1dbe55b67 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.4.0-80-generic N/A
linux-backports-modules-5.4.0-80-generic N/A
linux-firmware 1.187.15
SourcePackage: linux
UpgradeStatus: Upgraded to focal on 2020-11-09 (264 days ago)
dmi.bios.date: 11/26/2009
dmi.bios.vendor: Intel Corp.
dmi.bios.version: TYG4110H.86A.0036.2009.1126.2047
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: DG41TY
dmi.board.vendor: Intel Corporation
dmi.board.version: AAE47335-302
dmi.chassis.type: 3
dmi.modalias:
dmi:bvnIntelCorp.:bvrTYG4110H.86A.0036.2009.1126.2047:bd11/26/2009:svn:pn:pvr:rvnIntelCorporation:rnDG41TY:rvrAAE47335-302:cvn:ct3:cvr:
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1938626
Title:
PPS API broken
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