
While the sound changes are generous and affect the many different areas, some highlights include continued work on Intel Skylake audio, some new sound drivers, HD audio fixes for Dell / Lenovo / HP systems, and various other internal fixes and cleaning.
New Linux sound drivers for the 4.9 kernel include Nuvoton NAU88C10, Realtek RT5660, and Realtek RT5663. The change-log for the Linux 4.9 sound update mentions around three dozen Skylake sound changes still.
More details on the Linux 4.9 sound changes via this pull request.
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