Re: force DVI mode without audio

Re: 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@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@chris-wilson.co.uk>
    Reviewed-by: Keith Packard <keithp@keithp.com>
    Signed-off-by: Keith Packard <keithp@keithp.com>

commit 55b7d6e8c4690047ac001026cb75a47f747db816
Author: Chris Wilson <chris@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@chris-wilson.co.uk>

Thanks,
Fengguang

Re: force DVI mode without audio

[Wu Fengguang]

On Sat, Dec 31, 2011 at 01:20:11PM +0100, Andrea Arcangeli wrote:
> On Sat, Dec 31, 2011 at 09:28:37AM +0800, Wu Fengguang wrote:
> > 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
> 
> I wasn't aware about this one, thanks for the tip.
> 
> I tried:
> 
>         xrandr --output HDMI1 --set "audio" off
> 
> that made the sound working for half a second, then it stops working.
> 
> If I run:
> 
>         xrandr --output HDMI1 --set "audio" on
>         xrandr --output HDMI1 --set "audio" off
> 
> at every invocation (including "on") I can hear sound for half a
> second and then it stops no matter if it's left on or off.

That's an interesting bug. What's the kernel version you are running?
The dmesg may tell something (especially if boot with "drm.debug=6").

> So I applied my patch again for now. If you fix the above I guess
> adding a little script to my KDE autostart directory would work fine.

OK.

> Also note, CTRL+ALT+F1 going back to console doesn't help either. I
> didn't try to play audio before starting X though, not sure what
> happens if I never run X and I try to play audio.

Yeah, that could be a problem. I see that

/sys/class/drm/card0/card0-HDMI-A-1/

exports several drm connector properties, however the (currently still
i915 specific) "audio" property is not there. It should be good to
make it a general one and export it in drivers/gpu/drm/drm_sysfs.c.

> BTW, initially I tried to set only has_audio to false, but that wasn't
> enough I had to set hdmi to off too and force it to DVI mode to make
> audio work with my TVLCD (LG brand).

You mean the "has_hdmi_sink = false"? Well does that mean we need to
one more property for it? The property _interface_ is per port, which
can support 2+ HDMI/DP jacks well.

Thanks,
Fengguang

[PATCH] drm/i915: add an "off-dvi" HDMI audio mode

[Wu Fengguang]

Andrea,

Would you test this patch at convenient time?

Thanks,
Fengguang

---
Subject: drm/i915: add an "off-dvi" HDMI audio mode
Date: Fri Jan 06 11:04:00 CST 2012

When HDMI-DVI converter is used, it's not only necessary to turn off
audio, but also to disable HDMI_MODE_SELECT and video infoframe. Since
the DVI mode is mainly tied to audio functionality from end user POV,
add a new "off-dvi" audio mode:

	xrandr --output HDMI1 --set audio off-dvi

Reported-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h    |    7 +++++++
 drivers/gpu/drm/i915/intel_hdmi.c  |    8 +++++---
 drivers/gpu/drm/i915/intel_modes.c |    4 +++-
 3 files changed, 15 insertions(+), 4 deletions(-)

--- linux.orig/drivers/gpu/drm/i915/i915_drv.h	2011-12-22 10:53:26.000000000 +0800
+++ linux/drivers/gpu/drm/i915/i915_drv.h	2012-01-06 11:20:03.000000000 +0800
@@ -736,6 +736,13 @@ typedef struct drm_i915_private {
 	atomic_t forcewake_count;
 } drm_i915_private_t;
 
+enum hdmi_force_audio {
+	HDMI_AUDIO_OFF_DVI = -2,	/* no aux data for HDMI-DVI converter */
+	HDMI_AUDIO_OFF,			/* force turn off HDMI audio */
+	HDMI_AUDIO_AUTO,		/* trust EDID */
+	HDMI_AUDIO_ON,			/* force turn on HDMI audio */
+};
+
 enum i915_cache_level {
 	I915_CACHE_NONE,
 	I915_CACHE_LLC,
--- linux.orig/drivers/gpu/drm/i915/intel_hdmi.c	2011-12-22 10:53:27.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_hdmi.c	2012-01-06 11:03:56.000000000 +0800
@@ -335,7 +335,9 @@ intel_hdmi_detect(struct drm_connector *
 	if (edid) {
 		if (edid->input & DRM_EDID_INPUT_DIGITAL) {
 			status = connector_status_connected;
-			intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
+			if (intel_hdmi->force_audio != HDMI_AUDIO_OFF_DVI)
+				intel_hdmi->has_hdmi_sink =
+						drm_detect_hdmi_monitor(edid);
 			intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
 		}
 		connector->display_info.raw_edid = NULL;
@@ -411,8 +413,8 @@ intel_hdmi_set_property(struct drm_conne
 		else
 			has_audio = i > 0;
 
-		if (has_audio == intel_hdmi->has_audio)
-			return 0;
+		if (i == HDMI_AUDIO_OFF_DVI)
+			intel_hdmi->has_hdmi_sink = 0;
 
 		intel_hdmi->has_audio = has_audio;
 		goto done;
--- linux.orig/drivers/gpu/drm/i915/intel_modes.c	2011-12-22 10:53:27.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_modes.c	2012-01-06 11:21:19.000000000 +0800
@@ -84,6 +84,7 @@ int intel_ddc_get_modes(struct drm_conne
 }
 
 static const char *force_audio_names[] = {
+	"off-dvi",
 	"off",
 	"auto",
 	"on",
@@ -106,7 +107,8 @@ intel_attach_force_audio_property(struct
 			return;
 
 		for (i = 0; i < ARRAY_SIZE(force_audio_names); i++)
-			drm_property_add_enum(prop, i, i-1, force_audio_names[i]);
+			drm_property_add_enum(prop, i, i-2,
+					      force_audio_names[i]);
 
 		dev_priv->force_audio_property = prop;
 	}

Re: [PATCH] drm/i915: add an "off-dvi" HDMI audio mode

[Jesse Barnes]

On Fri, 6 Jan 2012 11:26:40 +0800
Wu Fengguang <fengguang.wu@intel.com> wrote:

> Andrea,
> 
> Would you test this patch at convenient time?
> 
> Thanks,
> Fengguang
> 
> ---
> Subject: drm/i915: add an "off-dvi" HDMI audio mode
> Date: Fri Jan 06 11:04:00 CST 2012
> 
> When HDMI-DVI converter is used, it's not only necessary to turn off
> audio, but also to disable HDMI_MODE_SELECT and video infoframe. Since
> the DVI mode is mainly tied to audio functionality from end user POV,
> add a new "off-dvi" audio mode:
> 
> 	xrandr --output HDMI1 --set audio off-dvi
> 
> Reported-by: Andrea Arcangeli <aarcange@redhat.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
> ---

My only complaint here is that off-dvi isn't an intuitive name.  We
don't have any better way of detecting an HDMI->DVI converter with
other EDID bits perhaps?

A better name might be off-dvi-mode or off-dvi-only or something.

-- 
Jesse Barnes, Intel Open Source Technology Center

Re: [PATCH] drm/i915: add an "off-dvi" HDMI audio mode

[Wu Fengguang]

On Fri, Jan 06, 2012 at 07:08:33AM -0800, Jesse Barnes wrote:
> On Fri, 6 Jan 2012 11:26:40 +0800
> Wu Fengguang <fengguang.wu@intel.com> wrote:
> 
> > Andrea,
> > 
> > Would you test this patch at convenient time?
> > 
> > Thanks,
> > Fengguang
> > 
> > ---
> > Subject: drm/i915: add an "off-dvi" HDMI audio mode
> > Date: Fri Jan 06 11:04:00 CST 2012
> > 
> > When HDMI-DVI converter is used, it's not only necessary to turn off
> > audio, but also to disable HDMI_MODE_SELECT and video infoframe. Since
> > the DVI mode is mainly tied to audio functionality from end user POV,
> > add a new "off-dvi" audio mode:
> > 
> > 	xrandr --output HDMI1 --set audio off-dvi
> > 
> > Reported-by: Andrea Arcangeli <aarcange@redhat.com>
> > Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
> > ---
> 
> My only complaint here is that off-dvi isn't an intuitive name.  We
> don't have any better way of detecting an HDMI->DVI converter with
> other EDID bits perhaps?

We have 

        intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);

which _should_ auto detect HDMI/DVI connections.

I guess Andrea ran into problem with that due to broken EDID. Anyway
I'll try to test if that drm_detect_hdmi_monitor() will ever work for
the HDMI/DVI monitors in my lab.

> A better name might be off-dvi-mode or off-dvi-only or something.

OK, will change to "off-dvi-mode".

Thanks,
Fengguang

Re: [PATCH] drm/i915: add an "off-dvi" HDMI audio mode

[Wu Fengguang]

On Sat, Jan 07, 2012 at 09:39:19PM +0800, Wu Fengguang wrote:
> On Fri, Jan 06, 2012 at 07:08:33AM -0800, Jesse Barnes wrote:
> > On Fri, 6 Jan 2012 11:26:40 +0800
> > Wu Fengguang <fengguang.wu@intel.com> wrote:
> > 
> > > Andrea,
> > > 
> > > Would you test this patch at convenient time?
> > > 
> > > Thanks,
> > > Fengguang
> > > 
> > > ---
> > > Subject: drm/i915: add an "off-dvi" HDMI audio mode
> > > Date: Fri Jan 06 11:04:00 CST 2012
> > > 
> > > When HDMI-DVI converter is used, it's not only necessary to turn off
> > > audio, but also to disable HDMI_MODE_SELECT and video infoframe. Since
> > > the DVI mode is mainly tied to audio functionality from end user POV,
> > > add a new "off-dvi" audio mode:
> > > 
> > > 	xrandr --output HDMI1 --set audio off-dvi
> > > 
> > > Reported-by: Andrea Arcangeli <aarcange@redhat.com>
> > > Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
> > > ---
> > 
> > My only complaint here is that off-dvi isn't an intuitive name.  We
> > don't have any better way of detecting an HDMI->DVI converter with
> > other EDID bits perhaps?
> 
> We have 
> 
>         intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
> 
> which _should_ auto detect HDMI/DVI connections.
> 
> I guess Andrea ran into problem with that due to broken EDID. Anyway
> I'll try to test if that drm_detect_hdmi_monitor() will ever work for
> the HDMI/DVI monitors in my lab.

I verified that drm_detect_hdmi_monitor() at least works fine for me
when HDMI<>DVI converter is used:

[   12.567158] [drm:intel_hdmi_detect], has_hdmi_sink=0 has_audio=0 force_audio=0

So it's probably Andrea's monitor sending the wrong EDID.

Thanks,
Fengguang

Re: [PATCH] drm/i915: add an "off-dvi" HDMI audio mode

[Wu Fengguang]

On Fri, Jan 06, 2012 at 05:12:57PM +0100, Andrea Arcangeli wrote:
> On Fri, Jan 06, 2012 at 07:08:33AM -0800, Jesse Barnes wrote:
> > A better name might be off-dvi-mode or off-dvi-only or something.
> 
> force-dvi is probably better name, off is counter intuitive.

Yeah, "force-dvi" looks good!

> I didn't test the patch yet, I'll do soon.

Thank you! It did take effect judging from the dmesg on my HDMI box,
however I've not yet tested the HDMI-to-DVI setup.

Thanks,
Fengguang