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[i915] [SKL] sound resampling issues using HDMI output

Submitted by Christoph

Assigned to Intel GFX Bugs mailing list

Link to original bug (#100279)

Description

In the current stable (4.10.3-1) and mainline (4.11.0-rc2) kernels of Arch Linux I noticed resampling issues when playing 44.1kHz audio using the HDMI output of my i915 chipset on a Asus Z170-A motherboard. This issue wasn't present in previous releases but I didn't take the time to bisect and find the relevant commit yet.

In the following, hw:0,3 refers to the HDMI output of the HDA Intel PCH.

speaker-test -D hw:0,3 -c 2 -r 48000 -f 440 -t sine

This produduces a fine 440Hz sine wave.

speaker-test -D hw:0,3 -c 2 -r 44100 -f 440 -t sine

This produces a way lower frequency sound with clicking noises about twice a second.

Running the same on the analog output doesn't result in any resampling issues.

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