Chromebook with chtmax98090 card no sound

[Jesse777]

Hello, I have Lenovo N21 computers with Ubuntu on them but with no sound. The sound card is the chtmax98090 and I have copied the proper UCM file to the alsa folder and I do transition from a dummy output in the sound settings to a recognized built-in audio. I can open pavucontrol and see the sound is being recognized but I get no sound on the speakers or any headphones I plug in. I have also opened up alsamixer and enabled and unmuted everything I could but still no sound. The computer does recognize when I plug in a headset though switching between the speakers and headphones and vice versa. But again no sound I'm hoping you can help.

[plbossart]

some of those Braswell devices have different platform clocks used, and there's been a set of changes at the kernel level to use platform clock 1 instead of the default 3.
I've tested all this on a Cyan device and it works fine, so it's likely a kernel issue really.

[Jesse777]

Good call on the kernel version being the problem. Updating it and then using your solution does enable the sound. Now though it resets the alsamixer settings on every restart I’m working to fix. Thank you for your help and swift response.

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On Jan 21, 2020, at 10:01 AM, Pierre Bossart ***@***.***> wrote:  some of those Braswell devices have different platform clocks used, and there's been a set of changes at the kernel level to use platform clock 1 instead of the default 3. I've tested all this on a Cyan device and it works fine, so it's likely a kernel issue really. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.