https://bugs.freedesktop.org/show_bug.cgi?id=106597

--- Comment #24 from Lukas Wunner <lukas@wunner.de> ---
(In reply to taijian from comment #22)
> $ grep . /sys/bus/hdaudio/devices/hdaudioC1D0/widgets/*/power_caps
> /sys/bus/hdaudio/devices/hdaudioC1D0/widgets/01/power_caps:0xc0000009

According to the HDA specification r1.0a, page 209
(https://www.intel.com/content/dam/www/public/us/en/documents/product-specifications/high-definition-audio-specification.pdf)
this decodes as:

EPSS supported
CLKSTOP supported
D3 supported
D0 supported

Hm, looks fine at first glance. I think I'll need dmesg output with the 3rd
debug patch to understand what's going wrong.

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