Bug 400979

Summary: Device Preference "Test" button ignores selected device, only plays to default
Product: [Frameworks and Libraries] Phonon Reporter: Jonathan Marten <jjm>
Component: settingsAssignee: Harald Sitter <sitter>
Status: REPORTED ---    
Severity: normal CC: bugseforuns, myriam
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Compiled Sources   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Jonathan Marten 2018-11-12 20:28:47 UTC 
SUMMARY

The tool tip over the "Test" button says that it should test the selected device, i.e. the one selected in the scrolling list.  However, it appears to ignore the selected device and always plays the test sound to the default one.

STEPS TO REPRODUCE
1. Open System Settings - Hardware - Audio and Video - Device Preference
2. Click "Test", the test sound plays through the default (initially selected) device
   (on my system, "HDA ATI SB, ALC888 Analog Default Device).
3. Select another device (on my system, "HDA NVidia, HDMI 1 HDMI Audio Output")
4. Click "Test" again, the sound again plays through the default device.  No sound is heard
   over HDMI.

OBSERVED RESULT

Test sound is always played through the default device.

EXPECTED RESULT

Test sound should be played through the selected device.

SOFTWARE/OS VERSIONS
Windows: 
MacOS: 
Linux/KDE Plasma: 5.14.80
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.52.0
Qt Version: 5.11.2

ADDITIONAL INFORMATION

Phonon backend: VLC
Phonon-VLC version (shown on Backend page): 0.10.2
VLC application version: 3.0.3
PulseAudio in use: no

Sounds play correctly through HDMI with aplay or the VLC media player.

Bug 390270 seems similar, but is referring to the "speaker test" page (the one that is no longer in plasma-desktop as of commit 06c8b9ba on 26 Jul 2018).
Comment 1 Patrick Silva 2019-02-21 16:19:52 UTC 
I can confirm with phonon-qt5-vlc 0.10.2 on Arch Linux.
Test works when onboard sound card (default device) is selected, but it fails when I select hdmi port - I listen test sound via onboard sound card again.

Operating System: Arch Linux 
KDE Plasma Version: 5.15.1
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.1
Comment 2 Jonathan Marten 2019-05-04 12:45:31 UTC 
Have investigated and found a possible solution.
See https://phabricator.kde.org/D21015