Logitech G935 Equalizer Support

[Tom-jm03]

Description

Hey,

i would really like to use the equalizer on linux, because the headset sounds like trash otherwise.

May i ask, why it hasn't been implemented yet? Is it because it hasn't been reverse engineered?

If so, i can provide specific device details etc.

I found out that the equalizer gets parsed via json and lays under Program Files/LGHUB/data/eq_presets.json and pro_eq_presets.json.

It looks something like this:

    {
      "id": "d27c3937-c03e-4fd5-9871-19c773513060",
      "name": "EQUALIZER_COMMUNICATIONS",
      "attribute": "EQUALIZER",
      "applicationId": "",
      "profileId": "",
      "readOnly": true,
      "equalizer": {
        "simple": [
          0,
          0
        ],
        "advanced": [
          0,
          -0.96,
          -0.96,
          1.92,
          3.6,
          4.32,
          3.6,
          3.6,
          1.68,
          0.96
        ],
        "deviceType": "SPEAKER",
        "type": "ADVANCED",
        "name": "EQUALIZER_COMMUNICATIONS"
      }
    }

Headset Name

Logitech G935

[Sapd]

Hello,

May i ask, why it hasn't been implemented yet? Is it because it hasn't been reverse engineered?

Yes. You would have to use WireShark to find out how the packets work: https://github.com/Sapd/HeadsetControl/wiki/Development-1-%E2%80%90-Adding-a-device#adding-a-completely-new-headset

[Tom-jm03]

Thank you :)

I will try my Luck.

[Tom-jm03]

I'm some steps further now.

If you select a Equalizer in the GHUB Software, nothing is being sent between the Headset/Host so it seems like that the Equalizer is Software Side?

But I found out something else.

When you select Headset -> Settings in the bottom left corner -> On-Board Equalizer you have the option to save a Equalizer on the Device itself and that actually did send something over USB:

So i will try now to manually send this data back.
But there is something i don't quite understand.
The max Volume on Linux is way lower compared to Windows. But i don't know why exactly..

Maybe you have a clue?

[Tom-jm03]

Hey,

i got a error when trying to send some Data.

Am i doing something wrong?

./headsetcontrol --dev -- --device 0x046d:0x0a87 --send-feature --receive " 0x1c, 0x00, 0x90, 0x92, 0xfd, 0x9c, 0x8c, 0xe4, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x1a, 0x00, 0x00, 0x00, 0x00, 0x02, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x11, 0xff, 0x07, 0x1a, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00"

The error i get after running:

Failed to send data. Error: -1: ioctl (SFEATURE): Broken pipe
I tried to get the battery level from the headset and it worked (with the -b option).

I haven't really worked with USB before, so pardon me, if I'm over seeing something.

[Sapd]

The order of your parameters is mismatched. For some reason you put in the data after --receive which cannot work, as the data has to belong to the send command.

Also instead of send-feature you probably should try --send THEDATA