No sound on Raspberry Pi using DVI

Hello. I’m just getting into RISC OS again and have realised I’m not getting sound
I’m using a DVI monitor and powered external speakers connected to the stereo 3.5mm socket.
I’ve tried searching the forum and saw a posting saying to use
hdmi_drive=2 to force sound over HDMI and I think
hdmi_drive=1 should turn HDMI sound off but I’m not getting a beep
I was using rc6 and have now tried rc8
Any pointers please?

T.

I think you need hdmi_drive=1 to force sound onto the jack but you need hdmi_drive=2 to force video over the HDMI (rather than composite video) if the GPU cannot detect an HDMI monitor – say for example you are using a HDMI to VGA adaptor. You can’t have both.

I connected the Pi to my HDMI input TV and sound was fine with no hdmi_drive setting or hdmi_drive=2
If I use hdmi_drive=1 I get no sound from the TV or the stereo 3.5mm socket.

Debian does give sound on the stereo 3.5mm socket when set appropriately so I know that is not the problem.
Some results on another borrowed Pi.

Am I missing something obvious?

You should get sound over the audio jack with hdmi_drive=1 but you will need amplified speakers (I think).

That is what I thought!
The speakers are powered and if I turn them and do something like a file count on the SD card I can hear the background noise of ‘processing’ on sound but CTRL G doesn’t give a beep.

but CTRL G does give a beep.

That is correct behaviour.

Sorry I made a typo, it should have said: “but CTRL G doesn’t give a beep.”

Still soundless…

What version of RISCOS 5.19 do you have? I have RISC OS 5.19 (19-Mar-2013) [i.e. RC8] with powered speakers connected to the audio jack and the following ‘SDFS::0.$.!Boot.Loader.CONFIG.TXT’ file and I get sound with no difficulty:

fake_vsync_isr=1
gpu_mem=64
init_emmc_clock=100000000
kernel=RISCOS.IMG

That doesn’t work for me, as well.

A long while back I thought I read in the Pi forum that once you had used hdmi_drive a flag was set permanently for the Pi that would not allow you to send audio to the socket. I cannot find it now.

Can I ask whether you have ever used hdmi_drive with your Pi?

Steve, there is no such permenent flag on hdmi. You may confuse this with some overclocking options that they do set a permanent bit within the SOC. Do you have the 2nd gen RPi ? (512MB RAM)

Can I ask whether you have ever used hdmi_drive with your Pi?

Don’t think so (but I think this is a red herring). I have tried the same SD card with a model A, a model B (256M) and a model B (512M) and sound works on all of them.

Nothing seems to work here.

I’m using a Pi-View from element14 ( HDMI to VGA adaptor)which works very well but without sound.
If I disconnect the adaptor I get the Ctrl-G beep on bootup but can’t then reconnect the adaptor to get a display.

I think I’ve tried all the hdmi_ combinations without any sucess.

I am sure that there should be a way to force HDMI (rather than composite video) and to specify a screen mode (as the GPU can’t ‘see’ the monitor over HDMI with a VGA adaptor) and still to have sound at the audio jack.

But there may not be. Element 14 should know as they are an Acorn-friendly dealer (the rump of Acorn ended up as element 14).

Element 14 should know as they are an Acorn-friendly dealer (the rump of Acorn ended up as element 14)

[panto] Oh no they didn’t [/panto]

Element 14 Limited was indeed the company formed from what was left of Acorn, which subsequently did a management buy out and eventually got snapped up by Broadcom.

Element 14 the brand name of the hobby section of Premiere Farnell, one of the distributors of the Pi, have nothing to do with Acorn and aren’t an Acorn dealer in that sense.

and aren’t an Acorn dealer in that sense.

They’re selling seeds or dodgy PCs under the counter?

Jumping back to the original point of No Sound on a Pi.

I have been trying, with no luck, to get sound out of the Pi audio jack, whilst using an HDMI-2-VGA convertor bought at the Wakefield Show.

The picture is perfect, but no sound anywhere. Any further ideas, or do I have to buy another convertor with an audio jack built in? If so, where do I get one?

There is an option hdmi_force_hotplug=1 that is supposed to force HDMI if your display isn’t detected. That and the HDMI drive option to switch to DVI mode (and sound on the headphone jack) should logically work (though you might need the hdmi_mode and hdmi_group options to force a suitable display mode?).

Anyway, hdmi_force_hotplug, have you tried that?

[ http://elinux.org/RPiconfig ]

My problem is getting the sound, no the video.

Even so, I have tried hdmi_force_hotplug. No difference.

But I hope I have now solved the problem by ordering an HDMI-2-VGA converter with audio.

Well my problem became moot when the monitor started fizzing.
I’ve replaced it with an HDMI monitor with built in speakers so I’m now sorted and a happy bunny!

My problem is getting the sound, no the video.

Yeah, I know that. But the type of video you have apparently determines the audio output:

• No HD – analogue video and headphone jack audio
• DVI style HD – no audio (thus headphone jack)
• HDMI style HD – with audio (thus headphone jack silent)

I kind of wish the GPU firmware could be poked to ALWAYS do audio on the headphone jack. I wonder if the HDMI audio nonsense is a hangover from DRM or something?

So, you would want the hdmi_force_hotplug to tell the Pi that something HD is connected, then whatever hdmi_drive option selects DVI style. That ought to end you with HD output and headphone jack audio. But this is from reading the docs, not real life as I am still stuck on composite video, have not yet got around to sorting out (or, cough, affording) a HDMI→VGA adaptor.

The HDMI-2-VGA adaptor, with audio, is on order.

and, if they are as quick with this as everything else, it should be here tomorrow.

@John

I Ordered one off Ebay & got NO Sound OR Video.
I set in Config.txt
hdmi_force_hotplug=1 to force video through the converter
hdmi_drive =1 to send audio through the converter.

Picture & Image now works great.

Yes, mine works great with those two config.txt statements.

I had the same problem last year and the only way to fix it was, as you have done, by ordering a HDMI → VGA adaptor with sound and it has worked perfectly since. It seems odd to me that they don’t dump out audio to the jack regardless as this seems quite a common issue for people.

I did a bit of testing with Linux on this issue, as I want to be able to use headphones with my lapdock, and found the following to be true:

running the command:
amixer cset numid=3 x
Where x is either 0 for default, 1 for analogue audio and 2 for hdmi digital audio will set the appropriate audio output mode for the BCM chip.

if hdmi_drive=2
amixer cset numid=3 x
x = 0: HDMI audio can be heard
x = 1: analog audio can be heard
x = 2: HDMI audio can be heard

hdmi_drive=1
amixer cset numid=3 x
x = 0: no audio can be heard
x = 1: analog audio can be heard
x = 2: no audio can be heard

hdmi_drive=2 allows digital and analogue – digital is selected by default
hdmi_drive=1 allows analogue only – nothing is selected by default

Changing hdmi_drive only turns hdmi audio on and off, it doesn’t effect the analogue audio out.

Setting hdmi_ignore_hotplug=1 enables the analogue audio (tested in RISC OS) but disables the hdmi video (and audio).

What do you think?