https://bugs.kde.org/show_bug.cgi?id=426258
Bug ID: 426258
Summary: alsa backend not working for AMD 4000 (renoir)
soundcard - (possible mixer name collision)
Product: kmix
Version: unspecified
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Soundcard specific
Assignee: es...@kde.org
Reporter: adam.miku...@centrum.cz
Target Milestone: ---
SUMMARY
Unable to choose alsa mixer/card (hw1,0) due to possible collision with
mixer/card (hw0) which has identical name, this applies only to this specific
audio hardware:
lspci | grep -i audio
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 1637
03:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD]
Raven/Raven2/FireFlight/Renoir Audio Processor (rev 01)
03:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models
10h-1fh) HD Audio Controller
STEPS TO REPRODUCE
# aplay -l
card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Generic [HD-Audio Generic], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Generic_1 [HD-Audio Generic], device 0: Generic Analog [Generic Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
# kmixremote list
ALSA__HD_Audio_Generic_1
ALSA__HD_Audio_Generic_1
MPRIS2__Playback_Streams_1
# kmixremote list ALSA__HD_Audio_Generic_1
IEC958_0
IEC958_1
# kmixremote list ALSA__HD_Audio_Generic_1
IEC958_0
IEC958_1
EXPECTED RESULT
Actually, the second mixer/card contains mixer controls for audio channels, but
it cannot be selected. I can't read c++ but I've checked the sources and I
guess card names comes from alsalib, apparently they are not unique and there
may be some confusion when controls for mixer/card are enumerated when called
by card "name" so it always return 2 hdmi IEC958 controls of the first card
(alsa card hw0). It seems to me mixers/cards are detected correctly, because in
GUI when I click configure kmix, volume control tab, where I see basically
output of 'kmixremote list', both mixers/cards with name "HD-Audio Generic" has
different icons, the second correct card has icon like volume slider, so the
kmix internal pointers to cards may be correct, but controls of the cards may
be enumerated by its name which is not unique, so always controls of first card
are returned - but this is only my speculation.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: latest kernel 5.8.5
KDE Plasma Version: plasma 5.19.4, kmix 20.08.1
KDE Frameworks Version: 5.73.0
Qt Version: 5.15.0
ADDITIONAL INFORMATION
Following system-wide alsa configuration is necessary for audio to work, so the
soundcard works correctly, alsamixer works as expected, only kmix is not usable
because it only shows sound muted icon and no actual mixer controls can be
selected.
#cat /etc/asound.conf
pcm.!default {
type plug
slave {
pcm "hw:1,0"
}
}
ctl.!default {
type hw
card 1
}
I would be happy to test possible patch because it requires access to this
specific hardware.
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