this is to report an issue with the nvidia UNIX driver.
The issue appears at least
on Dell Precision 7510 hardware
with Quadro M1000M rev a2
running Fedora 29/x86_64 and
nvidia driver version 415.22 or above
with packages from https://negativo17.org/repos/multimedia/
Other installations with Optimus hardware may likely be
affected as well.
The driver breaks headphone audio support at least on Dell Precision 7510
laptop hardware. Audio playback can be started and is heard playing through
the integrated speakers. When a headphone jack is plugged in (may be
an actual headphone or line-in cable), no audio signal is provided.
Instead, pop and click-noises are heard that suggest some DC voltage
is present on the line. Changes of headphone volume or other settings
do not change the behaviour.
There is no defect in the headphone audio hardware itself, as has been
verfied by starting from an installer live-image and playing test
sound from the KDE settings dialog. Also, if no nvidia driver is installed,
headphone audio works fine too.
edit: added NVIDIA hardware description