ACK: [SRU][B/OEM-B/D][PATCH 0/1] Intel HDMI audio print "Unable to sync register" errors

Connor Kuehl connor.kuehl at canonical.com
Tue Aug 27 14:50:13 UTC 2019


On 8/15/19 6:39 PM, Hui Wang wrote:
> BugLink: http://bugs.launchpad.net/bugs/1840394
> 
> 
> This fix is in the v5.3-rc3, and EAON already has this patch by backporting stable, so
> this patch is only for B/D.
> 
> [Impact]
> After S3, the intel hdmi audio on a dell laptop print the error like below:
> [ 2052.030247] snd_hda_codec_hdmi hdaudioC0D2: Unable to sync register 0x2f0d00. -5
> 
> And the hdmi audio can't work anymore after this.
> 
> [Fix]
> For Intel hdmi audio codec, it doesn't need to resume forcibly, because the i915 side
> probably is not ready to let hdmi codec work, since the intel hdmi audio uses component
> framework, let i915 control the hdmi codec.
> 
> [Test Case]
> Tested on that dell laptops, the hdmi audio doesn't have any issues anymore after
> applying this patch.
> 
> [Regression Risk]
> Low. We tested this patch on a couple of machines (dell and lenovo).
> 
> 
> Takashi Iwai (1):
>    ALSA: hda - Don't resume forcibly i915 HDMI/DP codec
> 
>   include/sound/hda_codec.h  | 2 ++
>   sound/pci/hda/hda_codec.c  | 8 ++++++--
>   sound/pci/hda/patch_hdmi.c | 6 +++++-
>   3 files changed, 13 insertions(+), 3 deletions(-)
> 

Acked-by: Connor Kuehl <connor.kuehl at canonical.com>



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