Good day! We are debugging a custom config of G505S coreboot which currently can't boot beyond SeaBIOS to any Linux: kernel gets stuck at the early booting stages regardless of its' parameters. So we can't access cbmem console, and are exploring the alternative console output options. One of them is spkmodem - console output through this G505S laptop's speakers. But we can't decode any symbols of its' output with spkmodem-recv, regardless of the options we use, or whether we're trying parec or arecord to achieve that.
I suspect: despite that the "PC Speaker"-style beeping output is working fine at this laptop/speakers while we are using Linux or even some very simple OS like FreeDOS or Kolibri - that coreboot's spkmodem might be buggy at G505S laptop, since there are only a few distinct beeps (a couple of them are long enough to be visible at Soundcloud's waveform) - everything else sounds like maybe an encrypted message but could be just garbage (far from being similar to some morse code)
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? Its the first ~4 minutes of like 30 minutes log output, then the sounds stop:
just play - https://soundcloud.com/qma-ster/g505s-spkmodem download - https://www.sendspace.com/file/y2j15y
Best regards, Ivan