[Intel-gfx] force DVI mode without audio

[Wu Fengguang]

Hi Andrea,

On Fri, Dec 30, 2011 at 08:07:27PM +0100, Andrea Arcangeli wrote:
> Hi,
> 
> after upgrading my HTPC to HD3000 graphics (2700K), I didn't find
> anymore a way to disable the hdmi audio from the DVI2HDMI cable (I
> connect DVI output of the motherboard to the HDMI input of the LCDTV
> in HD). So I added it to the driver as it looks a missing tweak that I
> need.
> 
> (I also have proper audio setup connected to the second output of the
> soundcard, but unless I watch a movie or listen music I keep it off so
> I like the LCDTV speaker to work too, and if I turn on the proper
> sound then I mute the TV)
> 
> With the readon I was using radeon.audio=0 at boot to achieve the
> exact same thing. Without this, the LCDTV won't play the audio coming
> from the line in analog cable as it's fooled into thinking the audio
> comes through the hdmi cable when it cannot.
> 
> It's all working perfectly now.

Have you tried the "audio" property which can be listed with

        xrandr --prop

Thanks,
Fengguang
---

Related commits:

commit 3f43c48d333777e815ae68d66396cb6dfbc2dd79
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu May 12 22:17:24 2011 +0100

    drm/i915: Share the common force-audio property between connectors
    
    Make the audio property creation routine common and share the single
    property between the connectors.
    
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Reviewed-by: Keith Packard <keithp at keithp.com>
    Signed-off-by: Keith Packard <keithp at keithp.com>

commit 55b7d6e8c4690047ac001026cb75a47f747db816
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Sep 19 09:29:33 2010 +0100

    drm/i915/hdmi: Add 'force_audio' property
    
    Allow the user to override the detection of the sink's audio capabilities
    from EDID. Not all sinks support the required EDID level to specify
    whether they handle audio over the display connection, so allow the user
    to enable it manually.
    
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Thanks,
Fengguang