Sound issues with computer model: iMac (21.5-inch, Mid 2014)

[ldiserio]

I installed Kubuntu 24.04 on my iMac (21.5-inch, Mid 2014) with a new solid state hard drive as the sole operating system. There is a problem with the sound,
1, every time it goes to sleep sound does not work after waking up, have to reboot to get sound back,
2, the left and right configurations are all off no matter which Playback Devices I choose in Audio settings. One side is very low in sound, one is high or goes to rear instead of one side etc.
3, the volume control does not work properly. I have tried several suggestions but nothing worked.

Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.8.0-35-generic (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-4260U CPU @ 1.40GHz
Memory: 7.7 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 5000
Manufacturer: Apple Inc.
Product Name: iMac14,4
System Version: 1.0I installed Kubuntu 24.04 on a new hard drive in my

[oshunluvr]

I don't see anything in the above computer specs regarding the sound hardware. At least try this in Konsole and post the output: aplay -l

You might consider running "sudo dmesg" and "cat /var/log/syslog|less" in Konsole and looking for entries referring to audio.

[ldiserio]

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CS4208 Analog [CS4208 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: CS4208 Digital [CS4208 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0

[ldiserio]

I found this with "sudo dmesg" [ 19.153851] Broadcom 43xx driver loaded [ Features: PNL ]
[ 19.188197] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input16
[ 19.191125] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input17
[ 19.193946] input: HDA Intel PCH SPDIF as /devices/pci0000:00/0000:00:1b.0/sound/card0/input18

With this "cat /var/log/syslog|less", it is endless, just keeps rolling.

[ldiserio]

I tried Debian and Ubuntu live, exact same problem. Anybody have any solutions for my Mac desktop?

[ldiserio]

Headphones work plugged into 1/8 pin jack

[oshunluvr]

FYI, Kubuntu is based on Ubuntu and Ubuntu is based on Debian so I wouldn't expect the results to vary.

I crawled the web a bit and this looks like a very common problem. The CS4208 just isn't supported, or at least not well.

This might be a solution.

[ldiserio]

I also found this one but they are for Macbooks not desktops. Not sure if there is a difference. Yes not much support for Mac Linux. https://github.com/davidjo/snd_hda_macbookpro

[Snowhog]

Totally a long shot, but at least worth trying. If it doesn't work, or makes things worse (not likely), you can always undo the change.

See https://ubuntuforums.org/showthread....79#post9020279

[ldiserio]

I tried the github drivers, no sound now, cannot undo it. Do not understand the Ubuntu link instructions.

[Kubuntubantu]

En tiedä miten tuohon ongelmaan voisi löytyä ratkaisu. Asensin 5 päivää sitten Kubuntun iMac ja kaikki toimii, ei ole ollut mitään ongelmia.

Translated Finnish to English:

I don't know how to find a solution to that problem. I installed Kubuntu on my iMac 5 days ago and everything works, there have been no problems.

4 x Intel i5-5575R
Memo: 16GB
Processor:Mesa Intel iris Pro Graphics 6200
iMac 16,2
Apple