On 3/19/21 11:58 AM, Hans de Goede wrote:

Hi All,

First of all this is NOT intended as a way to get more attention to recently noticed BYT/CHT bugs. I realize it may feel that way but that is not my intention. My goal of this email is to have a honest discussion about what will be the best driver to use by default for BYT/CHT for Fedora 34.

With that said, there are a number of SOF related issues with audio on BYT/CHT devices, some recent issues and one issue which is fixed, but only in 1.7 for which no release has been made yet:

"[BUG][BYT][CHT] Output channel left/right swap on various BYT/CHT devices with various codecs" https://github.com/thesofproject/sof/issues/3699 Status: Fixed in master, but still present in latest sof-bin release (1.6.1)

"[BUG][BYT][CHT] Linux 5.11 Cherrytrail/rt5640 emits persistent beeping sound after a short while" https://github.com/thesofproject/sof/issues/3868 Status: Still being investigated.

"[BUG][CHT] loud crackle from speakers at boot, which does not happen with SST driver" https://github.com/thesofproject/sof/issues/3932 Status: Still being investigated.

"[BUG][BYT] SOF hangs, logger shows "dw_dma_start(): dma 1 channel 1 not ready" error" https://github.com/thesofproject/sof/issues/3937 Status: Still being investigated, configuring pipewire to use 16 bits samples seems to be a workaround (but I did manage to trigger 3868 in that configuration)

The crackle is more of an annoyance then a blocker (but it is quite annoying), but the 2 beep/hang bugs are kinda showstoppers IMHO.

As such ATM I believe that the best way forward is for me to flip the default for Fedora 34 back to SST during the coming week (before the final freeze kicks in) and then to try again with Fedora 35.

Thanks for sharing Hans. It's disappointing that we still see such instability on old hardware, but yes at the moment I don't see how such issues might be fixed short term. I don't think anyone on the Intel side has switched to pipewire and we also have limited number of test devices. I have also lost track of when 1.7 might be released.

On Fri, 2021-03-19 at 21:52 +0100, Hans de Goede wrote:

...

Thanks for sharing Hans. It's disappointing that we still see such instability on old hardware, but yes at the moment I don't see how such issues might be fixed short term. I don't think anyone on the Intel side has switched to pipewire and we also have limited number of test devices. I have also lost track of when 1.7 might be released.

Ok, thank you for the quick answer. I don't expect this to get fixed short term either,

so I'll flip the default used in the Fedora 34 kernels back to SST coming week, so

that F34 final will use SST.

Fwiw, I've kicked off some planning to get PW into the audio CI.

Liam

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