Re: Signalling no-audio for HDMI

[Alex D. <ale...@gm...>]

2010/3/30 Hendrik Sattler <po...@he...>:
> Am Dienstag 30 März 2010 19:30:38 schrieb Christian König:
>> > > It seems your TV refuses to use audio from analog stereo cable, when
>> > > it detects audio enabled over/in HDMI (just enabled, even purely
>> > > silent as in your case). And it seems we enable HDMI mode even when
>> > > you use radeon.audio=0.
>> > >
>> > > I've no idea what could affect this between 2.6.33-rc8 and 2.6.33
>> > > (stable). The list of changes for drm/radeon taken from
>> > > http://lkml.org/lkml/2010/2/24/301 :
>> >
>> > It doesn't seem to be the kernel, actually. I already tried with
>> > booting rc8
>> > and it is the same. Must be one of the other parts, then...
>>
>> I also have no idea which change caused this, but the fix is rather
>> simple, just also disable the HDMI encoders when the audio codec gets
>> disabled by the module option. A patch is attached.
>>
>> > Can you provide "lspci" output by the way?
>>
>> This is the second laptop where I see this strange configuration. From
>> the video drivers point of view everything is present (audio codec, HDMI
>> encoders, etc...), but the audio codec doesn't seems to be connected to
>> the PCI bus, so alsa can't see it.
>>
>> I have no idea how we could auto detect this case, but the attached
>> patch should be a good workaround.
>
> Yes. But didn't work. I will test something else (different computer with
> definitely DVI-only) or maybe you have some other ideas.

Some TVs always assume audio will come over hdmi if the port is in
use.  There may be an option in your TV's setup menus to disable that.

Alex