[Applied][Raring PATCH] Ubuntu (no-up): ALSA: hda - fixup D3 pin and right channel mute on Haswell HDMI audio

Tim Gardner tim.gardner at canonical.com
Thu Apr 11 14:31:21 UTC 2013


On 04/11/2013 07:28 AM, Leann Ogasawara wrote:
> On 04/11/2013 06:09 AM, Leann Ogasawara wrote:
>> Applied to Raring master-next.
> 
> Hi David,
> 
> After I'd applied this to Raring master-next, there was some concern
> raised about the patch via the #ubuntu-kernel IRC channel.  We are
> hoping to get some clarification and feedback from you.
> 
> [06:12:36] <rtg_> ogasawara, actually, I was gonna question David on
> that patch. it seems over engineered to me.
> [06:14:13] <ogasawara> rtg_: I thought it seemed fairly well contained
> and tested
> [06:14:40] <ogasawara> rtg_: it's not too late to yank it if you have
> reservations
> [06:15:12] <rtg_> ogasawara, in that it only affects haswell. however,
> why not just force the D0 and mute settings rather then interrogate the
> HW ? less code I think.
> [06:17:24] <ogasawara> rtg_: it's a valid question, want me to punt it
> till we get clarification?
> [06:18:54] <rtg_> ogasawara, if we can get ahold of him today.
> [06:20:23] <rtg_> ogasawara, by collapsing the code into a more
> definitive form I might worry about audio artifacts such as pops and
> clicks whilst programming those registers. thats really what I'd like to
> confirm from him.
> 
>>
>> On 04/11/2013 12:38 AM, David Henningsson wrote:
>>> BugLink: https://bugs.launchpad.net/bugs/1167270
>>>
>>> This patch has been tested on two machines, and found to resolve one
>>> of the HDMI audio issues on Haswell.
>>>
>>> The root cause is lack of synchronisation between the video driver and
>>> the audio driver. Upstream wants to resolve this by adding
>>> synchronisation mechanisms, so they won't take this patch. But since
>>> kernel freeze is today, I wanted to ask you to accept this
>>> intermediate workaround, which at every playback start checks for the
>>> error and corrects it if found.
>>>
>>>
>>>
>>>
>>
> 

Perhaps something like the attached.

-- 
Tim Gardner tim.gardner at canonical.com
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