Re: [coreboot] Lenovo G505S - spkmodem console sound, is correct? Please listen and tell

[Peter Stuge]

Ivan Ivanov wrote:
> If you've ever heard the spkmodem output, please could you try to
> decode this stuff if its' easy for you, or at least to tell if it
> sounds OK or not?

It sounds somehow like I remember spkmodem, but the file is very low
amplitude (too quiet) and I can't confirm whether the signal is the
correct speed.

I've only received spkmodem successfully with the microphone right
next to the speaker - moving the mic only a few cm lost signal.

Note that spkmodem-recv requires 48k s16le mono PCM.

I tried decoding, resampling and normalizing the ogg file without success
so I suggest increasing amplitude at the source; move the mic closer to
the speaker and use the parecord | spkmodem-recv command as documented
in spkmodem-recv.c. Make sure to set your mic input volume to 0dB (and
not higher!) so that you get the best possible signal, without attenuation.

//Peter

Lenovo G505S - spkmodem console sound, is correct? Please listen and tell

[Denis 'GNUtoo' Carikli]

On Thu, 27 Sep 2018 22:36:47 +0000
Peter Stuge  wrote:
> I tried decoding, resampling and normalizing the ogg file without
> success so I suggest increasing amplitude at the source; move the mic
> closer to the speaker and use the parecord | spkmodem-recv command as
> documented in spkmodem-recv.c. Make sure to set your mic input volume
> to 0dB (and not higher!) so that you get the best possible signal,
> without attenuation.

On some device like the i945 Thinkpads, connecting an audio cable in
the output jack plug works, so you can record a clean signal by doing
that and by messing with the sound volume buttons before re-booting.

I've tried that on a gm45 Thinkpad also with coreboot, and I wasn't
able to redirect the sound.

Denis.