The bug has been fixed with this commit upstream drm-tip repository (with cc to
stable):
https://cgit.freedesktop.org/drm-tip/commit/?id=d81fb7fd9436e81fda67e5bc8ed0713aa28d3db2
Note it also affects Zesty.
** Bug watch added: freedesktop.org Bugzilla #101583
https://bugs.freedesktop.org/show
I had been trying to cherry-pick patches from the working Xenial kernel
to mainline, and got bogged down with build issues. Back to the
bisection:
This kernel ...
http://kernel.ubuntu.com/~jsalisbury/lp1657994/linux-image-4.4.0-040400-generic_4.4.0-040400.201702021530_amd64.deb
.. does not work.
For this kernel, no audio. Failure mode is like 4.4 mainline.
Just to understand: the strategy is to bisect between two mainline
kernels with different failure modes (4.4 final and 4.5rc1), with the
hope that between the two there will be a good kernel?
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Yes, 4.4.0-21 is good, just like 4.4.0-59.
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https://bugs.launchpad.net/bugs/1657994
Title:
Regression: HDMI audio produces no sound (Skylake NUC)
Status in linux package
Both kernels behave like any of the kernels from 4.5: no sound on HDMI.
Recapping:
Ubuntu 4.4.0-59: HDMI audio works properly
Mainline 4.4 (any): i915 drm driver does not seem to support Skylake,
HDMI audio not enumerated
All of the below kernels exhibit the same problem: HDMI produces no soun
Kernel behavior summary:
Ubuntu 4.4.0-59: HDMI audio works properly
Mainline 4.4 (any): i915 drm driver does not seem to support Skylake,
HDMI audio not enumerated
All of the below kernels exhibit the same problem: HDMI produces no sound
Mainline 4.5rc1
Mainline 4.5 final
Mainline 4.6 final
M
** Tags added: kernel-bug-exists-upstream
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1657994
Title:
Regression: HDMI audio produces no sound (Skylake NUC)
Status in linux package i
Public bug reported:
After upgrade from Xenial 16.04 to Yakkety 16.10, playing audio over HDMI no
longer produces sound.
* When booting with old kernel from Xenial (4.4.0-59), HDMI audio works fine
* Audio from headphone jack works fine
* Userspace seems to be happily playing to HDMI audio device
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