[Bug 93881] New: HDMI sometimes muted at boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=93881

            Bug ID: 93881
           Summary: HDMI sometimes muted at boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.0-rc1 Linux mainline
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: guillaume-florianx.vidal at intel.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 168301
  --> https://bugzilla.kernel.org/attachment.cgi?id=168301&action=edit
Logs from working and muted configuration

HDMI audio initialization seems uncomplete. HDMI playback is in progress but no
sound goes out from the monitor although volume is correctly set.
$ speaker-test -D hw:PCH,3 -c 2 -t wav

Reproducing steps are unclear, but it is more likely to occur before first
playback. Opening Ubuntu Audio settings UI fixes the problem (without changing
any setting).
It is not necessarily a regression as the bug is rare, we can have missed it in
the past.

I took snapshots of audio components states when HDMI is muted and working,
please find them attached.
Differences seems to show that in Codec: Intel Valleyview2 HDMI, Node 0x02
[Audio Output] is not Enabled, and IEC958 is Off. Intel_audio_dump output shows
also some differences.

My environment is:
BAY TRAIL M / Notebook ACER Aspire ES1-512
*Hardware*
Platform: Aspire ES1-512 (ACER) - Notebook
Processor Family : ATOM
CPU Type: Intel(R) Celeron(R) CPU  N2840  @ 2.16GHz 
Signature : Type ,  Family: 6, Model: 55, stepping: 8
(SoC : VLV2 C0)
*Software*
Linux distribution: Ubuntu 14.04 LTS 64 bits
Kernel: 4.0-rc1 from
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
BIOS : v1.09

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