Re: [GIT PULL] sound updates for 4.21

[Linus Torvalds]

On Thu, Dec 20, 2018 at 7:38 AM Takashi Iwai <tiwai@xxxxxxx> wrote:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git tags/sound-4.21-rc1

Hmm.

It turns out that commit c337104b1a16 ("ALSA: HD-Audio: SKL+: abort
probe if DSP is present and Skylake driver selected") causes my laptop
(XPS13 9350) to no longer suspend.

The screen goes dark, but the power light never turns off. There's
nothing in the logs.

> Pierre-Louis Bossart (16):
>       ALSA: HD-Audio: SKL+: abort probe if DSP is present and Skylake driver selected

Sadly, that commit does not revert cleanly, since it's preparatory for
a lot of other changes.

Here's the lspci output:

  /sbin/lspci -s 0:1f.3 -vn
  00:1f.3 0403: 8086:9d70 (rev 21) (prog-if 80)
  Subsystem: 1028:0704
  Flags: bus master, fast devsel, latency 32, IRQ 16
  Memory at dc328000 (64-bit, non-prefetchable) [size=16K]
  Memory at dc300000 (64-bit, non-prefetchable) [size=64K]
  Capabilities: <access denied>
  Kernel driver in use: snd_soc_skl
  Kernel modules: snd_hda_intel, snd_soc_skl

and it's a bog-standard Intel i7-6560U laptop.

I have no real information, except that I bisected the (reliable)
behavior to this commit. Before that commit, suspend/resume works
fine. After that commit, suspend just hangs and leaves a dead machine.

            Linus