Bug 1270552

Created attachment 1083984 [details]
alsa-info.txt

I have attached the ALSA hardware information available from my Chromebook Pixel (2015) in order to provide further details regarding the audio input/output devices currently being shown on a Fedora 23 installation.

According to Duncan Laurie at Google, the I2S and RT5677 codec must be updated in order to allow sound to work correctly on the Chromebook Pixel (2015). See his comment here:

https://plus.google.com/+OlofJohansson/posts/1yopVMjEhjK

The above comment was from March 11, 2015, but sound is still non-functional as of Fedora 23 (kernel 4.2.5-300.fc23.x86_64). According to 'aplay -l', which should have bdw-rt5677 if the driver was correctly loaded, the following devices are found:

**** List of PLAYBACK Hardware Devices ****
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

*** Bug 1221857 has been marked as a duplicate of this bug. ***

There is a project to build patched kernels (for Debian and Arch).  I think it's mostly some scripts to generate patches from the upstream Chromium OS kernel source.

https://github.com/raphael/linux-samus

As Nathaniel indicated, there are several projects on GitHub that include patched kernels for Ubuntu/Debian and Arch Linux. These projects are generating patches from the Chromium OS kernel source, but it would be extremely helpful if patches were created for Fedora (and possibly Red Hat).

https://github.com/raphael/linux-samus

https://github.com/tsowell/linux-samus

Also, the correct output for 'aplay -l' should be the following (pulled from installation notes in the raphael/linux-samus repo):

**** List of PLAYBACK Hardware Devices ****
card 0: bdwrt5677 [bdw-rt5677], device 0: System Playback (*) []
  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

"upstream" bugreport is here: https://bugs.chromium.org/p/chromium/issues/detail?id=573776

The ASoC driver is a fairly easy forwardport, but as mentioned the codec side of the chromeos kernel has diverged more significantly from mainline.

happy to report that a kernel built from the raphael/linux-samus repo has sound working on my Pixel 2 / Fedora 23

@dave Maley could you please share those steps or how you built the kernel for Fedora? I tired (briefly) on my 2015 pixel and it gave me a number of issues.

Thanks!

(In reply to James Flowers from comment #8)
> @dave Maley could you please share those steps or how you built the kernel
> for Fedora? I tired (briefly) on my 2015 pixel and it gave me a number of
> issues.

I just followed the "Other Distributions" installation steps outlined on the raphael/linux-samus readme.

I did however run thru the "Enabling sound step-by-step" bits rather than running the sound.sh script provided.

*********** MASS BUG UPDATE **************
 
We apologize for the inconvenience.  There is a large number of bugs to go through and several of them have gone stale.  Due to this, we are doing a mass bug update across all of the Fedora 23 kernel bugs.
 
Fedora 23 has now been rebased to 4.7.4-100.fc23.  Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel.
 
If you have moved on to Fedora 24 or 25, and are still experiencing this issue, please change the version to Fedora 24 or 25.
 
If you experience different issues, please open a new bug report for those.

This issue is still present in mainline but there are now patches from John Keeping to add the drivers.

That's good to know. Keep us informed if the drivers are accepted into mainline.

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The current status here is that mainline v4.9 will have support out of the box (I've been using / testing the RCs).  So when F25 moves to a 4.9 or later based kernel this can be closed.

Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is
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